@@BobbySmith-ci5by shes still getting her engine together its comeing along nicely i think carburetors are neat and they are really responsive when correctly tuned
I can not thank you enough for taking the time and being a solid ass dude enough to teach the masses about carbs. It's a subject i never found a mentor to teach me
Well done good video I am an old drag racer from the 70s and 80s good info you are spot on you refreshed my memory looking forward to more videos. Thank you !
Thanks mate , really appreciate this and all your videos. I don't think you guys realize how many people are talking about your channels down here in Australia 👍
You have said you feel like you aren’t entertaining enough for this or you’re not the best at explaining but you have a great way of explaining and showing how it all works. Your videos are actually very relaxing and informative. Don’t ever change old man!
On a Ford small block I wouldn't be surprised if the manifolding has something to do with it. If you look at the runner lengths of the typical single carb cast intake ( single or dual plane ) the inner and outer runners have pretty broad length differences, so the velocity differences will affect the air/fuel ratios cylinder to cylinder. Add in an engine combination that has a lot of "pull" on the intake side then the situation gets aggravated causing fuel curve problems. I bet if the intake manifolding was designed with better cylinder to cylinder balance, the fuel curve issues would stop.
This is exactly what I was looking and hoping for. Step by step, what and why....taking the mystery out of carburetors for me! Thank you Bill, you are a good teacher.
Nice video and information. I think you hit the nail on the head at 8:05 when you said at 8.5” of vacuum the power valve will close and at vacuum below the power valve will open. Helped me get complete understanding of how it works. Thanks
Thank you pops for taking the time to help us followers who don't know any better. It's much appreciated. I have been fighting this problem for a long time and now I have something to go on. Look forward to your videos every day
I’ve been watching carb tuning videos for about a month now and this one video has been more helpful than most. Thank you for the knowledge! Got a slightly pumped up 440 Cuda with a proform 750 that I’m trying to dial in. Feels pretty decent overall.
Thank you for this. Im sure there’s a lot of information out there and plenty of videos to learn about carburetors, but to here from someone that will not only break it down and simplify how things work, but also knows the different scenarios and can teach a variety of situations weather your just street driven a little hot rod around all the way up to understanding and successful controlling a blow through monster like y’all have done. (Yeah that’s what I got out of this video already!)...So I appreciate the knowledge and hope you find time to continue this series and your able to do multiple videos on this topic. I can listen to you and learn from you all day long weather you believe it or not! Keep up the good work
Appreciate this video so much. Starting out doing carbs with no one to help and no really good videos like this on RUclips has made it a struggle! So thank you!
Great video Old Man! Would love to have you tune the 750HP on my 396 Camaro. I have it “close” but I know someone with your knowledge could get it perfect. My father knew all this stuff but he passed away 13 years ago when I was only 19. I watch your videos and it reminds me of my “old man”. Thanks for sharing this knowledge and these videos 👍
This was totally worth the watch. Thank you very much 'old man', appreciate you. I have something to try in the spring now, upping the power valve to a 8.5 from a 6.5.
What would make mine run crazy rich at idle? I’m talking 10.0 afr. I’ve done smaller primary jets and used a vaccine gauge to make sure it’s as close as good as I can get it
@@kaleblevi44 sounds like your power valve might be staying open at idle. Whatever your engine pulls for vacuum at idle your power valve number needs to be lower than that at bare minimum so it will stay closed at idle. Would be the first thing I'd check.
@@Josh-vx6lf a failed power valve will cause it. They do no like it when there is a backfire or pop back through the carb. The heat will destroy the thin membrane that makes up the valve.
@@1fastlx Yes, that's why I suggested to look at the power valve first lol A busted diaphragm could definitely cause it too no doubt. But since holley added the check valve in 92 to keep from blowing power valves every time there is a backfire this is a much less common failure. I see a lot of guys who are new to carbs throw a new carb on something with a huge cam that makes 5 in/hg at idle and the factory power valve is a 6.5 leaving it open at idle.
I am new to Holley carburetors. ( all my experience has been on Weber down draft and side draft carbs). You broke this down and made it so simple that I am no longer timid of tuning my Holley. I have a VW turbo drag engine that has a 780 Holley. Thank you for taking the time to share your knowledge.
Brings back memories I still have my 3 guage vacuum set with all the hoses and tees I was that guy in high school great refresher course I even still have my timing light with the knob thanks for great information as always
Best explanation of a power valve circuit. In the 70’s Holley published a very good soft cover book on their carburetors. Had one for years and finally gave it to someone who needed it desperately. Don’t know if it is still in print but it was a very good book to have when tuning/setting up a Holley carb. Thank you for this video. You are a very good teacher, sir.
Thank you old man for helping us guys out had a 383 with a 750 brawler on it was not happy in my dad's 1957 Corvette after using your tricks with the air bleeds I went to 80 pump the timing up around 40 cannot even believe it's the same animal appreciate your help so much never ran so good was really getting frustrated you are one genuine guy thank you would love to see your shop someday I'm from Western Pennsylvania
I’m building a 72 camaro RS in a storage unit. I worked on Apache helicopters in the army, and decided to build a car to help with my PTSD. Yes I am a disabled combat veteran, and I absolutely love you and your sons videos and content. Your videos especially sir exceptional and top notch. I am learning very much from you and I wanted to express my gratitude and appreciation. Thank you and have a blessed day.
Thank you so much please keep sharing and making these types of videos. I Love learning and the way you break things down makes me want to know more so please keep doing what your doing. Thank you sincerely Russell Hopkins.
Thanks bill , great explanation. I do a few each month and if I don't have a vacuum reading to start with I put the 6.5 power valve in that's supplied in the kit . Here in western North Carolina I am at 3400 ft above sea level I run 110 renegade fuel with a proform 750 on a 12.1 sbc I run a 3.5 and 65 main jets with a 850 base plate. It's doing great as of driving and wide open throttle. Thanks for going in-depth about the well jets most guys don't know about changing them for the transition to wide open throttle. Thanks for your time and consideration on this subject we all need alittle teaching from someone who has been on both ends of the carbs spectrum. Keep a thrashing brother 👍
Great video learned more about a carburetor than I have in my 60 years I’ve asked many a question without any answers looking forward to the rest of the videos thanks 🙏 much
I just learned more about the Holley power valve circuit than I have in the 15-20 years I've been running them LOL..... Looking forward to more of these Holley videos! Great work!!
Now, I know this is an old video and you’re doing this to help enthusiasts but I found a lot of help from reading David Vizard’s book on super-tuning Holley carbs, buying an AEM wideband O2S and using a vacuum gauge. Install the gauges, read the book, drive your car and study what the gauges do when you perform certain actions. The book will tell you what you’re looking for and the gauges will show it happen in real time. If you know when a power valve activates, at part throttle light acceleration like going up a hill, it becomes so easy to tune with these tools. Honestly it’s better than any old timer trying to teach you from a video… unless that old timer is sitting in the seat next to you explaining everything you’re seeing as it’s happening.
I'm 18 and love working on cars, I just finished my 78 nova and learned how to tune my edelbrock, but im building a 76 nova and I'm going to use a holley. This was the perfect video. Thanks Bill!!!
You are the type of young man that I know he would live to help and myself too!! If you enjoy it take your time and enjoy building your own cars they are way more rewarding than paying to have someone do it for ya buddy best of luck with what your working on!!
Thanks for your time and sharing your knowledge!! Im glad you touched on ford stuff because im a foxbody guy but im EFI. But its always good to gain knowledge.
Thank you for the information ole man! With me being a Ford guy mostly and fixing to do a turbo set up on a 302 with a carb this help me understand it more! Thank you 🇺🇸💪🏻👍🏻
Thanks for this! This will cure the problem I’m having. As for the small block ford undersized carb, everyone goes by the carburetor size equation, a 302 calls for like a 580ish cfm carb. So they stick on a 500 or a 600. If anyone says they’re running something bigger on one they’re chastised for it. (Speaking from experience) so that’s where it comes from. Anyways thanks for this video! I will be headed out to tune on my power valve!
Great info thank you I've been trying to learn more carb stuff but always seemed daunting. You made it seen easy and understanding. Can't wait for next video
Built a little solid roller 355, had an issue where the PV was coming on was coming on too early. Went to a 4.5. Had also went down in jet sized to rid the richness in not knowing it was the power valve. Smaller power valve leaned it up, went back up 5 jet sizes and it’s now super smooth when just driving. This is a great video for people who might’ve had the same issue. I had to learn the hard way 😂😂. Keep it up fellas y’all are awesome
Somehow I knew you was going to say the most difficult part to understand is the power valve, I truly believe that that is the most complicating part of the carburetor to understand. You definitely hit the nail on the head
Ive got a 92 s10....carberated ls 5.3....you are an awesome dude......i watch all yours and your sons videos....maybe a lil late sometimes....11 hour workdays...saving for the s10... KEEP ON KEEPIN ON...👍👍
Another great video Sir, I really am enjoying watching y'all's channel, thank you much for sharing your knowledge, I either had to practically beg for answers or read books and magazines for this info, I remember reading a article on this very same thing you spoke about I was the only one in my circle that knew about the holley power valve issue, all my buddies would slap Ebroks on which are perfectly fine if your puttering down main street ,but if you wanted to be fast holley was hard to beat, and I wasn't even thinking about any kind of fuel injection that shit was voodoo to me lol. Thanks again Old Man another home run.
great job old man i have lerned a lot from your videos ,im in the proses owe building a s10 all most done,ive picked up a lot owe pointers from you thanks old man ,nothing but respect for you
This was very very helpful thank you so much. I keep being told my 750 4150 is to big for my 302 with heads big cam and intake. U are very good at what u do sir thanks again.
Bill is a old school carburetor guru thank you Bill I appreciate all you Vicky the boss and the boys do for the sport God bless you 😁 such good people Hope to be able to meet you soon
I know this is an old video, but I had to comment I am a small block ford guy and my dad would always put a 600 Holley on my motors and they would go lean and detonate and break ring glands at hi rpm. He refused to listen to me about the carb saying a 600cfm is plenty big enough. I’m sending him this video!😂 Thanks Bill you are the man on carbs for sure.
Thanks old man I have a1957 vett was my dad's he was a lot like you but a bit before your time I put a blueprint 383 with a 750 brawler on it was not happy used your tricks with timing and idle air bleeds went to 80 s wow never ran so well is an whole different animal thank you for helping us guys out awesome show not many people like you guys left if love to see you setup someday live in western PA
Hello and thank you for sharing this info! I have watched quite a few Holley style tuning tip videos, but do not recall anyone talking about the the power valve and how if effects performance. Good stuff and makes perfect sense now. Thanks again and cheers from Motown!
This video came on as i was tuning my 850 proform to my truck .. ive ben building carbs for 30 of my 47 years ..ive made carbs out of a box of parts many of times but when it came to this proform i think id rather build a carb out of a box of junk parts as to get this thing dialed in .. your video showed me i dont know squat about a carb like i thought i did .. im gonna study it over and over until you make another carb video ..thanks Brother for the free education ..... Glenn from east Tn !!!
Thanks i have learned more with my ears open and mouth shut and with a little common sense have made my old stuff work well. I also got my degree in dirt driving a gravel truck for over 40 years.
You're one hundred percent spot on in regards to the small block Ford's and under sizing the carburetor...I class raced in the nmra and was required to run a maximum 650 double Pumper 310ci if chose carbureted application... This was a common problem. Because we had to turn the motors hard.
just getting ready to take apart and clean my holley screaming eagle double pumper on my harley so watching all the vid's on holley carbs even though this is not a motorcycle carb video it's good watching and understanding on how carbs work looking forward to the rest of the videos !!
Thank you so much for the information so informative. I'm going to check out my power valve. I dont know how many people have told me my 750 was to much on my .040. 302. And I told them it couldn't be cause it ran great dumping the clutch at wide open throttle and the plugs had just a slite whitish toasty color. But it still had a stumble if I accelerated from a cruise speed
Thank god I’ve been contemplating building a blow through carb motor or just going efi but i think after watching some of this i could def be swung to carb
Very methodical on your power valve explanation. Folks like yourself who know and understand carbs seem to be too far and in between. I have a Holley 2300 2bbl I am fixing to rebuild and set up on a slant 6; your discussion gave me some things to think about in checking to see if I need to go up in jet size and or power valve size, will know more when I tear carb apart for cleaning and rebuild after Thanksgiving:-)
Good video... vacuum gauge at wot will help you size a carburetor to your application,glad you explained it to help the ones who don't know...also a vacuum gauge will help you tune the idle air screws and determine what size power valve you need by taking a vacuum reading and dividing it by 2...example 13" of idle vacuum will need a 6.5 power valve.
Great content. I'm wanting to learn about carbs I know enough about to make it run great at wide open throttle so to know low end and top end is very good to know thank for all you do .. I meet y'all in Owensboro Kentucky and y'all some real solid people
This is what I've been waiting for thank you sir, cuz I'm running a carburetor till the day I die.But I wouldn't mind checking out some fuel injection on one of my hotrods!
Thanks for the info I learned something and Fords are all I have, I just recently put a Holley Sniper on my 351w so I'm trying to learn EFI tuning when I was just getting half way decent tuning Holley style carbs but will help on on my BBF I still run a carb on. Thanks again and keep up the carb info for sure as I see you picked up quiet a bit of trial and error of your years.
Great info Bill, I ran 750cfm holleys on my small block Windsor head fords, now the Cleveland style heads are more like the BBF, with long duration cams they don't tend to produce lots of manifold vacuum. I ran 750 to 1100 cfm carbs on those heads which as you correctly said though not as efficient as the Windsor design they can really flow. I never ran the 4 barrel cleveland heads except on my Boss 302 because for normal street use they liked really high rpms and finicky on timing and carb tune. The aftermarket Windsor style heads are closing in on flowing as much though. As always thanks for sharing.
Facts! Thank's I've done all the above on 302-460 lol currently running a 650dp proform on stock 460 if I'd seen this video sooner would have save time on set up! Great video keepem coming!
To back you up on people putting a small carb on a SB ford, I have a 70' Boss 302 and from the factory it came with a holley 780cfm. I know that's because of the huge valves in those heads and the car loves RPM. And I had to recently change the power valve due to the crappy gas here in NY state. Thanks for your knowledge, have a Merry Christmas and God Bless.
Great video Bill. I covered this same topic but with a wideband, so the viewer could see then changes in PV and cam shot size. Some people still don't, believe me, I hope they listen to you. 😁
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Who here feels the old man is just awesome 👏
Very Awesome
The best👍👍
He is very awesome guy and I can watch his channel all day long
Great info and are you going to tune Molly's Carb.
@@BobbySmith-ci5by shes still getting her engine together its comeing along nicely i think carburetors are neat and they are really responsive when correctly tuned
I can not thank you enough for taking the time and being a solid ass dude enough to teach the masses about carbs. It's a subject i never found a mentor to teach me
The reason why I subbed. The school of "Old Man"!!!
I never took the time to learn carbs so I'm glad ur doing this series. Never to young to learn
Or old 😁
Mudie Quattros 😂😂😂😂. Lmao
"Best damn garage in town!"
I agree with family is the only thing that i would of added
I agree!!
I'm that sbf guy lmao I learned about the small carbs the hard way but still learned alot from you hats off to Bill Sr
Well done good video I am an old drag racer from the 70s and 80s good info you are spot on you refreshed my memory
looking forward to more videos. Thank you !
Videos like this is why I gladly watch every commercial on this channel. Thanks for the great tips
Thanks old man I think this will get me where I need to be. Thank you very much for your time.
Thanks Bill! You nailed it. It’s amazing how much wrong information is out there on power valves and that whole circuit. Thanks for talking truth!
Thanks mate , really appreciate this and all your videos.
I don't think you guys realize how many people are talking about your channels down here in Australia 👍
And that is saying a lot being Aussies really seem to know how to build some awesome race engines!
You're exactly right I grew up tuning carburetors and totally enjoy fine tuning them thanks for sharing 👍 you guys are awesome 👌
You have said you feel like you aren’t entertaining enough for this or you’re not the best at explaining but you have a great way of explaining and showing how it all works. Your videos are actually very relaxing and informative. Don’t ever change old man!
Thank u it's just awesome to have somebody go through and explain all the ins and outs of what you guys do
Great job old bill keep the videos coming.I hope your son's know how great of a father they have. God bless you and your family Mr .bill
Bill Hoskins “Make carbs great again”. Should be on a tee shirt. I wonder if it’s the big bore on a 302 that causes that? Great information!
I'd buy 2 of those shirts for sure!!
On a Ford small block I wouldn't be surprised if the manifolding has something to do with it. If you look at the runner lengths of the typical single carb cast intake ( single or dual plane ) the inner and outer runners have pretty broad length differences, so the velocity differences will affect the air/fuel ratios cylinder to cylinder. Add in an engine combination that has a lot of "pull" on the intake side then the situation gets aggravated causing fuel curve problems. I bet if the intake manifolding was designed with better cylinder to cylinder balance, the fuel curve issues would stop.
This is exactly what I was looking and hoping for. Step by step, what and why....taking the mystery out of carburetors for me! Thank you Bill, you are a good teacher.
Nice video and information. I think you hit the nail on the head at 8:05 when you said at 8.5” of vacuum the power valve will close and at vacuum below the power valve will open. Helped me get complete understanding of how it works. Thanks
Keep these video's coming. I can sit here and watch you all day. Thats good to have someone like you to help other ppl out
Thank you pops for taking the time to help us followers who don't know any better. It's much appreciated. I have been fighting this problem for a long time and now I have something to go on. Look forward to your videos every day
Hit that thumbs up for the old man taking the time to teach us this stuff!!!
The humble attitude you have is what the world is severly lacking.
Thank you for teaching us those little things that make a world of difference. Thanks once again
I’ve been watching carb tuning videos for about a month now and this one video has been more helpful than most. Thank you for the knowledge! Got a slightly pumped up 440 Cuda with a proform 750 that I’m trying to dial in. Feels pretty decent overall.
One of the best carb videos I've ever seen. Thanks for sharing your knowledge.
Thank you sir, for taking the time to do this! Looking forward to the rest of the carburetor series.
Thank you for this. Im sure there’s a lot of information out there and plenty of videos to learn about carburetors, but to here from someone that will not only break it down and simplify how things work, but also knows the different scenarios and can teach a variety of situations weather your just street driven a little hot rod around all the way up to understanding and successful controlling a blow through monster like y’all have done. (Yeah that’s what I got out of this video already!)...So I appreciate the knowledge and hope you find time to continue this series and your able to do multiple videos on this topic. I can listen to you and learn from you all day long weather you believe it or not! Keep up the good work
Nothing like coming home after a hard week of moving earth and gaining knowledge from Mr Hoskins.
Appreciate this video so much. Starting out doing carbs with no one to help and no really good videos like this on RUclips has made it a struggle! So thank you!
Great video Old Man! Would love to have you tune the 750HP on my 396 Camaro. I have it “close” but I know someone with your knowledge could get it perfect. My father knew all this stuff but he passed away 13 years ago when I was only 19. I watch your videos and it reminds me of my “old man”. Thanks for sharing this knowledge and these videos 👍
This was totally worth the watch. Thank you very much 'old man', appreciate you. I have something to try in the spring now, upping the power valve to a 8.5 from a 6.5.
So true, about the small block ford, I've run 750 Holley carbs for years on my 302's. And I've been doing this stuff for 54 years.
What would make mine run crazy rich at idle? I’m talking 10.0 afr. I’ve done smaller primary jets and used a vaccine gauge to make sure it’s as close as good as I can get it
@@kaleblevi44 sounds like your power valve might be staying open at idle. Whatever your engine pulls for vacuum at idle your power valve number needs to be lower than that at bare minimum so it will stay closed at idle. Would be the first thing I'd check.
@@Josh-vx6lf a failed power valve will cause it. They do no like it when there is a backfire or pop back through the carb. The heat will destroy the thin membrane that makes up the valve.
@@1fastlx Yes, that's why I suggested to look at the power valve first lol A busted diaphragm could definitely cause it too no doubt. But since holley added the check valve in 92 to keep from blowing power valves every time there is a backfire this is a much less common failure. I see a lot of guys who are new to carbs throw a new carb on something with a huge cam that makes 5 in/hg at idle and the factory power valve is a 6.5 leaving it open at idle.
I am new to Holley carburetors. ( all my experience has been on Weber down draft and side draft carbs). You broke this down and made it so simple that I am no longer timid of tuning my Holley. I have a VW turbo drag engine that has a 780 Holley. Thank you for taking the time to share your knowledge.
Brings back memories I still have my 3 guage vacuum set with all the hoses and tees I was that guy in high school great refresher course I even still have my timing light with the knob thanks for great information as always
Best explanation of a power valve circuit. In the 70’s Holley published a very good soft cover book on their carburetors. Had one for years and finally gave it to someone who needed it desperately. Don’t know if it is still in print but it was a very good book to have when tuning/setting up a Holley carb. Thank you for this video. You are a very good teacher, sir.
Thank you old man for helping us guys out had a 383 with a 750 brawler on it was not happy in my dad's 1957 Corvette after using your tricks with the air bleeds I went to 80 pump the timing up around 40 cannot even believe it's the same animal appreciate your help so much never ran so good was really getting frustrated you are one genuine guy thank you would love to see your shop someday I'm from Western Pennsylvania
I’m building a 72 camaro RS in a storage unit. I worked on Apache helicopters in the army, and decided to build a car to help with my PTSD. Yes I am a disabled combat veteran, and I absolutely love you and your sons videos and content. Your videos especially sir exceptional and top notch. I am learning very much from you and I wanted to express my gratitude and appreciation. Thank you and have a blessed day.
Thank you for your service
Yes thank you for your service
Thank you for your service brother! Best of luck with the build!
Thanks everyone! It was my pleasure to serve!
As to the build I’m coming along. Have ran into a few issues so it’s been an adventure
Thank you so much please keep sharing and making these types of videos. I Love learning and the way you break things down makes me want to know more so please keep doing what your doing.
Thank you sincerely Russell Hopkins.
Thanks bill , great explanation.
I do a few each month and if I don't have a vacuum reading to start with I put the 6.5 power valve in that's supplied in the kit .
Here in western North Carolina I am at 3400 ft above sea level I run 110 renegade fuel with a proform 750 on a 12.1 sbc I run a 3.5 and 65 main jets with a 850 base plate.
It's doing great as of driving and wide open throttle.
Thanks for going in-depth about the well jets most guys don't know about changing them for the transition to wide open throttle.
Thanks for your time and consideration on this subject we all need alittle teaching from someone who has been on both ends of the carbs spectrum.
Keep a thrashing brother 👍
Great video learned more about a carburetor than I have in my 60 years I’ve asked many a question without any answers looking forward to the rest of the videos thanks 🙏 much
The best informative video I have seen lately I been wondering about the power valve for a long time.Thanks Old man
This is awesome cant wait for the rest of this series. Thanks for the great information!
My girl hears the string playing she runs in here tell me wait for her lmaooo
I just learned more about the Holley power valve circuit than I have in the 15-20 years I've been running them LOL..... Looking forward to more of these Holley videos! Great work!!
Now, I know this is an old video and you’re doing this to help enthusiasts but I found a lot of help from reading David Vizard’s book on super-tuning Holley carbs, buying an AEM wideband O2S and using a vacuum gauge. Install the gauges, read the book, drive your car and study what the gauges do when you perform certain actions. The book will tell you what you’re looking for and the gauges will show it happen in real time. If you know when a power valve activates, at part throttle light acceleration like going up a hill, it becomes so easy to tune with these tools. Honestly it’s better than any old timer trying to teach you from a video… unless that old timer is sitting in the seat next to you explaining everything you’re seeing as it’s happening.
Thank you so much old man. I never knew about the power valve. I'm still learning. You gelled me a lot.
Absolutely correct, boss 302 had huge carb from factory just because of what you said. Bravo on the free info to the world, thank you i appreciate it!
I'm 18 and love working on cars, I just finished my 78 nova and learned how to tune my edelbrock, but im building a 76 nova and I'm going to use a holley. This was the perfect video. Thanks Bill!!!
You are the type of young man that I know he would live to help and myself too!! If you enjoy it take your time and enjoy building your own cars they are way more rewarding than paying to have someone do it for ya buddy best of luck with what your working on!!
@@dragcarbuilder2075 way better than paying for it to be built! Thank youuu!!!!
Great video Bill I like the way you explain how it works and the purpose of it thanks for the information.
Thanks for your time and sharing your knowledge!! Im glad you touched on ford stuff because im a foxbody guy but im EFI. But its always good to gain knowledge.
Thank you for the information ole man! With me being a Ford guy mostly and fixing to do a turbo set up on a 302 with a carb this help me understand it more! Thank you 🇺🇸💪🏻👍🏻
That really helps. Great video old man. Thanks for taking the time to share your knowledge sir!
Thanks for this! This will cure the problem I’m having. As for the small block ford undersized carb, everyone goes by the carburetor size equation, a 302 calls for like a 580ish cfm carb. So they stick on a 500 or a 600. If anyone says they’re running something bigger on one they’re chastised for it. (Speaking from experience) so that’s where it comes from. Anyways thanks for this video! I will be headed out to tune on my power valve!
Great info thank you I've been trying to learn more carb stuff but always seemed daunting. You made it seen easy and understanding. Can't wait for next video
Thank you for taking the time to teach us about carbs... much appreciated
Built a little solid roller 355, had an issue where the PV was coming on was coming on too early. Went to a 4.5. Had also went down in jet sized to rid the richness in not knowing it was the power valve. Smaller power valve leaned it up, went back up 5 jet sizes and it’s now super smooth when just driving. This is a great video for people who might’ve had the same issue. I had to learn the hard way 😂😂. Keep it up fellas y’all are awesome
Somehow I knew you was going to say the most difficult part to understand is the power valve, I truly believe that that is the most complicating part of the carburetor to understand. You definitely hit the nail on the head
Ive got a 92 s10....carberated ls 5.3....you are an awesome dude......i watch all yours and your sons videos....maybe a lil late sometimes....11 hour workdays...saving for the s10...
KEEP ON KEEPIN ON...👍👍
Another great video Sir, I really am enjoying watching y'all's channel, thank you much for sharing your knowledge, I either had to practically beg for answers or read books and magazines for this info, I remember reading a article on this very same thing you spoke about I was the only one in my circle that knew about the holley power valve issue, all my buddies would slap Ebroks on which are perfectly fine if your puttering down main street ,but if you wanted to be fast holley was hard to beat, and I wasn't even thinking about any kind of fuel injection that shit was voodoo to me lol. Thanks again Old Man another home run.
great job old man i have lerned a lot from your videos ,im in the proses owe building a s10 all most done,ive picked up a lot owe pointers from you thanks old man ,nothing but respect for you
This was the best explanation! Thank you for sharing your hard earned knowledge.
I know this is old but it was so helpful to someone who feels they know just enough about carbs to get themselves in trouble.
This was very very helpful thank you so much. I keep being told my 750 4150 is to big for my 302 with heads big cam and intake. U are very good at what u do sir thanks again.
Thank you sir.. changed my power valve to 2 window 6.5. Downed jets to 71. Vacuum around 13 14. New plugs running better than it has in 7 years
The old man is right on point .worth his weight in gold .thank you old man .👍👍👍👍👍👍👍👍👍
Thanks, Bill. I'm new to the Holley Carb world, and this helped me understand it a bit better.
Bill is a old school carburetor guru thank you Bill I appreciate all you Vicky the boss and the boys do for the sport God bless you 😁 such good people Hope to be able to meet you soon
I know this is an old video, but I had to comment I am a small block ford guy and my dad would always put a 600 Holley on my motors and they would go lean and detonate and break ring glands at hi rpm. He refused to listen to me about the carb saying a 600cfm is plenty big enough. I’m sending him this video!😂 Thanks Bill you are the man on carbs for sure.
Thanks old man I have a1957 vett was my dad's he was a lot like you but a bit before your time I put a blueprint 383 with a 750 brawler on it was not happy used your tricks with timing and idle air bleeds went to 80 s wow never ran so well is an whole different animal thank you for helping us guys out awesome show not many people like you guys left if love to see you setup someday live in western PA
Fantastic! We can’t have a 57 Vette not sounding and running right!
This video helped me understand and fix my tuning issue. Thank you for this
Hello and thank you for sharing this info! I have watched quite a few Holley style tuning tip videos, but do not recall anyone talking about the the power valve and how if effects performance. Good stuff and makes perfect sense now. Thanks again and cheers from Motown!
I don't even have a Holley and I still enjoyed watching this
This video came on as i was tuning my 850 proform to my truck .. ive ben building carbs for 30 of my 47 years ..ive made carbs out of a box of parts many of times but when it came to this proform i think id rather build a carb out of a box of junk parts as to get this thing dialed in .. your video showed me i dont know squat about a carb like i thought i did .. im gonna study it over and over until you make another carb video ..thanks Brother for the free education .....
Glenn from east Tn !!!
Thanks i have learned more with my ears open and mouth shut and with a little common sense have made my old stuff work well. I also got my degree in dirt driving a gravel truck for over 40 years.
I remember me having this issue on my 351w fox, and you pretty much fixed the issue with a new 10 5 power valve,
Old Man , You are the Man. Thank for the video, Can't wait for the next one.
Thank you so much for sharing your knowledge with us. It really means a lot to me thanks again god bless
You're one hundred percent spot on in regards to the small block Ford's and under sizing the carburetor...I class raced in the nmra and was required to run a maximum 650 double Pumper 310ci if chose carbureted application... This was a common problem. Because we had to turn the motors hard.
Love this channel watch it all the time!
just getting ready to take apart and clean my holley screaming eagle double pumper on my harley so watching all the vid's on holley carbs even though this is not a motorcycle carb video it's good watching and understanding on how carbs work looking forward to the rest of the videos !!
Thank you so much for the information so informative. I'm going to check out my power valve. I dont know how many people have told me my 750 was to much on my .040. 302. And I told them it couldn't be cause it ran great dumping the clutch at wide open throttle and the plugs had just a slite whitish toasty color. But it still had a stumble if I accelerated from a cruise speed
Thank god I’ve been contemplating building a blow through carb motor or just going efi but i think after watching some of this i could def be swung to carb
Hopefully he explains blow threw in this series theres videos on making a holly 750 a blow threw and its pretty neat
Yes would definitely tune in with the masses, I'm sure, to get his ideas with knowledge and experience on blow through carb info or tuning. Ya yeet!
I love your videos. U r such a a good teacher. Billy for president!!!!
Very methodical on your power valve explanation. Folks like yourself who know and understand carbs seem to be too far and in between. I have a Holley 2300 2bbl I am fixing to rebuild and set up on a slant 6; your discussion gave me some things to think about in checking to see if I need to go up in jet size and or power valve size, will know more when I tear carb apart for cleaning and rebuild after Thanksgiving:-)
Now that was a good video and a very educational one I can't thank you enough
This old man is a window into a time when you could just find an answer on a cellphone and you had to figure it out. Great job sir
Good video... vacuum gauge at wot will help you size a carburetor to your application,glad you explained it to help the ones who don't know...also a vacuum gauge will help you tune the idle air screws and determine what size power valve you need by taking a vacuum reading and dividing it by 2...example 13" of idle vacuum will need a 6.5 power valve.
Your the best...ive been watching you from the start you humble old man..cant wait for the next video
Great content. I'm wanting to learn about carbs I know enough about to make it run great at wide open throttle so to know low end and top end is very good to know thank for all you do ..
I meet y'all in Owensboro Kentucky and y'all some real solid people
This is what I've been waiting for thank you sir, cuz I'm running a carburetor till the day I die.But I wouldn't mind checking out some fuel injection on one of my hotrods!
Thanks for the info I learned something and Fords are all I have, I just recently put a Holley Sniper on my 351w so I'm trying to learn EFI tuning when I was just getting half way decent tuning Holley style carbs but will help on on my BBF I still run a carb on. Thanks again and keep up the carb info for sure as I see you picked up quiet a bit of trial and error of your years.
Great practical info Bill, thanks for sharing!
I always look forward to you and billys vids there great vids and very informative 👍 so thx
Great info Bill, I ran 750cfm holleys on my small block Windsor head fords, now the Cleveland style heads are more like the BBF, with long duration cams they don't tend to produce lots of manifold vacuum. I ran 750 to 1100 cfm carbs on those heads which as you correctly said though not as efficient as the Windsor design they can really flow. I never ran the 4 barrel cleveland heads except on my Boss 302 because for normal street use they liked really high rpms and finicky on timing and carb tune. The aftermarket Windsor style heads are closing in on flowing as much though. As always thanks for sharing.
Facts! Thank's I've done all the above on 302-460 lol currently running a 650dp proform on stock 460 if I'd seen this video sooner would have save time on set up! Great video keepem coming!
Thank you for the tech tips. I honestly learned a little more.
You are telling nothing but the truth love it
Thank you Bill for the knowledge! I appreciate it!
To back you up on people putting a small carb on a SB ford, I have a 70' Boss 302 and from the factory it came with a holley 780cfm. I know that's because of the huge valves in those heads and the car loves RPM. And I had to recently change the power valve due to the crappy gas here in NY state. Thanks for your knowledge, have a Merry Christmas and God Bless.
Great video Bill. I covered this same topic but with a wideband, so the viewer could see then changes in PV and cam shot size. Some people still don't, believe me, I hope they listen to you. 😁