@@dzperformance7360Like David Vizard says "THE BIG BLOCK CHEVY IS UNDER VALVED" to make big horsepower with those would need atleast 2.25 to 2.30 valves. Especially with that old design.
Thanks a bunch for sharing. Mark at vortec pro I think gets arounnd 650+ with the 781 's on a 496 with a 238 isky roller. But i think he spends a fair amount of time on the heads. Might give Nick at clay smith cams a call. They have really fast service and their cams for the same duration are well over 600 lift. We have had great success with their products. And your talking to the guy on the phone , who is most likely gunna grind your cam..Have a great day!
Marks a master with #781 cylinder heads I own a set,, He did for me,, He's just on a different level, I Believe his #781 heads are worth 35 horsepower. Better than anything I've ever did,
Great video! I put a set of Enforcers on my new 489, but haven’t run it yet. I haven’t seen to many videos featuring the Enforcers, so thanks for sharing dyno numbers !
Everyone talks crap about the AFR enforcer line but it gets it done every time. Thanks I'm buying some sir 🙏👍💪😎 also I have so Aluminum rods 6.385 MGP only 20 hits with JE 31cc dome pistons 4.500 bore with rings all together still , I also have a solid roller cam 775 lift came out of same engine... if you're interested sir . I'll give you an awesome deal or we can make a Dyno mule out of it 😁 all you need is block and crankshaft. Let me know ty thank you for all the information.
What's the most compression you have run on 93 octane pump gas??? 11.5.1?? Thanks BBC aluminum heads also your recommendation max compression 93 octane tuned right?
It really depends on how big a cam. How much cam duration and overlap you've got,, Iron heads=9.8 to 10.8 to1 depending on cam. Aluminum 10. to 11.5 to 1 depending on cam ? Those are the maximums in my experience,, Little cam you gotta stay towards the bottom, medium to large. You can go towards the top.
I love watching your comparisons. I wasn't aware there was enough material to go .100 overbore on a stock block but I'm not as familiar with big blocks. How much meat is left in the cylinder walls?
Nice 👍 I'm possibly doing a test soon. 781 fully ported By FORCFED me . Bigger valves . My question to you is " you think a 548 BBC with Diamond 33 cc dome pistons and.780 lift solid roller cam will clear the chamber and take lift ? I'm trying to see what I'll run in my StreetMod 28 Small Tire radials weight 2280 Chevy II SS Nova. Ran 5.5 in the 1/8 mile with 990 heads fully ported. Tiny smaller cam and around same dome .might try to get a tunnel ram for 781s with single Dominator ultra XP Carb.... Thank you sir Merry Christmas
Nice. Those 781s with more work would have matched the AFRs, but you can say the same if the enforcers . That cam is tiny for a bbc though. Nice video, great info.
I see you ask what my thoughts was on close chamber heads , They work just fine. If you put bigger valves in them , you need to have the machine shop d shroud them just a little bit on the intake side,, If you leave stock size valves in them , they work just fine the way they are
Hey Nick, love the channel! I found Mark's channel Vortec Pro a couple of years ago and it seems he came out with alot of videos then there was a break then he came back with 2 videos then nothing else? I binge watched all his stuff, i really liked how he explained and talked you through the thought process and how the prepare an iron headed stock crank, rod combo, i hope ge comes back with more videos. Anyway, your content is really resonates with me and is really insightful. I do have a question/suggestion for a future build, i live in central Indiana and E-85 is everywhere around me and you stated you are also a Midwestern so how about a high compression build similar to what you do but with at least 12:1 compression or more. I also really liked the poor man's 396 stroker, more of those please. Anyway just wanted to take a moment and let you know what your doing is very much appreciated.
I appreciate you watching ,I appreciate your input,, I've got that request several times about doing a high compression E85 street strip motor I'm gonna get on that. I got plans to do a 496ci 12.3 to 1. e85 motor , It probably be a couple months but I will get that video out, With dyno testing
I realized my mistake, my bad. I was talking to my friend Tony about your channel and I guess I had his name in my head🙄, that future build sounds great. I'm definitely looking forward to your channel growing.
Have you ever heard of Skip White Performance, they are out of Kingsport Tennessee. They sell parts and do machine work and they have what they call Bravo 335 aluminum BBC heads sold in pairs bare or complete and they seem like the best I've seen for the money, again not seeing them up close, who k ows, but they are selling them bare in pairs for $829 and complete depending on a hydraulic roller or solid package for around $1350, anyway it'd be great to see someone like Eric W. to give them a review.
I should have mentioned the timing,, I'm not playing with the timing on these combinations. For optimal horsepower, we just set it at 38° on every single big block. Because that's what all the Medium compression hydraulic roller, big blocks want give or take a degree.
Great information. I would like to see the total timing that each cylinder head wanted and if you could also share the engine vacuum at idle, maybe in the description, this would be very helpful for those of us planning on building a similar combination. cheers
Question, you ever run beehive springs on a hydraulic roller cam on a BBC aluminum head? If so what part number and any advantages? Thank you sir great videos
I use the 911- 16 valve springs on the very small hydraulic rollers I run the 929 - 16 on medium sized rollers and the 933 - 16 on the bigger hydraulic rollers
You know, I think most BBC oval port heads that are well prepared are good for 575-600 hp with a moderately sized hydraulic roller cam. Just never seen any of them do badly. Nice comparison.
You know, that would be a very cool test stock. Other than a basic valve job see what they would make on a strong motor,maybe 468ci?@Anarchy-Is-Liberty
@@dzperformance7360 how about trying a set of #820's or #292's? I think people are sleeping on those numbers. Their combustion chamber looks very promising for unshrouding the valve.
Wow those 781’s were impressive! Great vid, I’ll say it one last time, your gonna shit egg rolls if you ever get to dyno another build like that one with smaller tube headers!
Have you done a compression test on any of your 496 engines just curious how much pressure they make ? I’ll be checking my 505 that was run in a boat with Promaxx 319’s thanks I’m subscribed 😎🇺🇸
A stock 454 block can be bored as much as .125", 70 block, two bolt main... Has thick cylinder walls, I know I have one for my 468"... It is 4.310" and can go another .065". That is 32.5" per side...
Very nice, wonder how much you could lower the duration on that combo using the 781 at 119cc without giving up too much power and improve low speed drivability for a 4-speed street car. Thanks, and Keep Rolling........
I was reluctant to show this combination. It's not that great if the cam had a little more Lift a little less duration on the intake and more on the exhaust. It would have made more power and been evan more drivable,
Hi dz, do you have contact info? I’m wanting some cam advice for my street 505 in my 72 camaro. Hydraulic roller and afr enforcer or promaxx 317 heads. 91 octane fuel. Thanks!
@@dzperformance7360 thanks, I have a 454 with a pair of 781 heads and it seems better money to have 781 ported and valved rather than spend the money for aluminum heads. weight is not a disadvantage and staying 454-496 cid shouldn't need more head cfm for engine rpm to get the job done. need to ask locally, someone will know how or who. Love the channel!
I am building a 505 now except it’s 12.5.1 compression 714in solid roller with a 1050 Quick fuel dominator I wonder how much more hp my combo will make than this my heads flowed in the 360s
WHAT IS YOUR GAME ? .DO YOU DO THIS MOSTLY FOR FUN?, OR ARE YOU SAVING THE HOARD FOR BETTER TIMES BECAUSE THINGS ARE STARTING TO GET HARDER TO FIND AT REASONABLE PRICES. JUST CURIOUS. ANYWy good info as always. Have you ever thought of doing a 525 ??
My day job, I own a construction company,, But I have assembled motors for myself. Friends and family for over 30 years. Yes, it's mostly for fun, but I'm designing my own line of camshafs and carburetor spacers. Thanks for asking!!! Thanks for watching !!
yes , I have built those, That's too long of a stroke for a short deck. It creates too much windage. I've never produced any serious horsepower with those but they do make stupid great Torque,
My 468 makes 1.7 hp per cubic inch... 12.3 comp. BB-2 310 cc, heads. Regtangular ports, gasket matched to intake, Brodix round top intake with HVSS 2" 4 hole tappered spacer, 1050 cfm Dominator... 2.190" intake and 1.88" exhaust valve. Heads as cast.
Thanks for the compliment thank you so much for watching,, The only reason i'm using solid rollers in this test is just because it's what i've got on the shelf and it's easy,, For street strip use, I would always go hydraulic roller. A good name brand like Howard's. But I would never recommend flat tappet. They're a disaster,, The metal that use on those cams. Now you are guaranteed to have a flat cam very quickly,
Its not a fair comparison... square port against oval port ! It should be square port against square port . But after seeing the result i would go with the 781 without all the sign writing
Good effort tho ! Id like to see what you could get out of a 396 oval port with a cast crank, l feel that these engines are overlooked and underrated @dzperformance7360
Pretty impressive even with a small cam. Not bad for oval ports too!
The 781's came within 34 horses of the AFR heads, but I was disappointed. I really want to see them get closer than that,
@@dzperformance7360Like David Vizard says "THE BIG BLOCK CHEVY IS UNDER VALVED" to make big horsepower with those would need atleast 2.25 to 2.30 valves. Especially with that old design.
Thanks a bunch for sharing. Mark at vortec pro I think gets arounnd 650+ with the 781 's on a 496 with a 238 isky roller. But i think he spends a fair amount of time on the heads. Might give Nick at clay smith cams a call. They have really fast service and their cams for the same duration are well over 600 lift. We have had great success with their products. And your talking to the guy on the phone , who is most likely gunna grind your cam..Have a great day!
Marks a master with #781 cylinder heads I own a set,, He did for me,, He's just on a different level, I Believe his #781 heads are worth 35 horsepower. Better than anything I've ever did,
Great video! I put a set of Enforcers on my new 489, but haven’t run it yet. I haven’t seen to many videos featuring the Enforcers, so thanks for sharing dyno numbers !
Everyone talks crap about the AFR enforcer line but it gets it done every time. Thanks I'm buying some sir 🙏👍💪😎 also I have so Aluminum rods 6.385 MGP only 20 hits with JE 31cc dome pistons 4.500 bore with rings all together still , I also have a solid roller cam 775 lift came out of same engine... if you're interested sir . I'll give you an awesome deal or we can make a Dyno mule out of it 😁 all you need is block and crankshaft. Let me know ty thank you for all the information.
For the money they put out good power
Thanks for watching ,thanks for your input
What's the most compression you have run on 93 octane pump gas??? 11.5.1?? Thanks BBC aluminum heads also your recommendation max compression 93 octane tuned right?
It really depends on how big a cam. How much cam duration and overlap you've got,, Iron heads=9.8 to 10.8 to1 depending on cam. Aluminum 10. to 11.5 to 1 depending on cam ? Those are the maximums in my experience,, Little cam you gotta stay towards the bottom, medium to large. You can go towards the top.
@@dzperformance7360 aluminum Brodix 3 heads, 279 intake/ 288 exhaust @.050 and 765 intake valve lift/ .750 exhaust valve lift, 108 , timing events 31.5 / 67.5 exhaust @ 0.050 separation 111
548 cubic inch
Thanks 🙏👍
my 555 in my 1955 Chevy has a 264/274 @.050 with 11.4 to1 runs and races on 93 octane, In my opinion you could go 11.5 or more ?
@@dzperformance7360 thanks for you know your cranking compression please? Thanks again sir
no
I love watching your comparisons. I wasn't aware there was enough material to go .100 overbore on a stock block but I'm not as familiar with big blocks. How much meat is left in the cylinder walls?
I had this block sonic checked, anything that you bore over .070. You have to have checked for core shiftage, but many of them. You can go to .125
Thanks for the info! @@dzperformance7360
Nice 👍 I'm possibly doing a test soon. 781 fully ported By FORCFED me . Bigger valves . My question to you is " you think a 548 BBC with Diamond 33 cc dome pistons and.780 lift solid roller cam will clear the chamber and take lift ? I'm trying to see what I'll run in my StreetMod 28 Small Tire radials weight 2280 Chevy II SS Nova. Ran 5.5 in the 1/8 mile with 990 heads fully ported. Tiny smaller cam and around same dome .might try to get a tunnel ram for 781s with single Dominator ultra XP Carb.... Thank you sir Merry Christmas
Never did one quite like that so I don't know?? But thanks for watching
I sure love your channel! Thanks
I appreciate that!
Nice. Those 781s with more work would have matched the AFRs, but you can say the same if the enforcers . That cam is tiny for a bbc though. Nice video, great info.
Thanks for the great input,, Yeah you're right
What are your thoughts on the oval port closed chamber heads? I have some 390s on a 468. From what I've read, they originally came on a 396.
I don't believe i've ever owned a set of 390's, Do it and let us know what it produces
I see you ask what my thoughts was on close chamber heads , They work just fine. If you put bigger valves in them , you need to have the machine shop d shroud them just a little bit on the intake side,, If you leave stock size valves in them , they work just fine the way they are
I had a pair of 390 closed chamber heads on a 402 bbc. They were good heads lots of torque. 👍
Hey Nick, love the channel! I found Mark's channel Vortec Pro a couple of years ago and it seems he came out with alot of videos then there was a break then he came back with 2 videos then nothing else? I binge watched all his stuff, i really liked how he explained and talked you through the thought process and how the prepare an iron headed stock crank, rod combo, i hope ge comes back with more videos. Anyway, your content is really resonates with me and is really insightful. I do have a question/suggestion for a future build, i live in central Indiana and E-85 is everywhere around me and you stated you are also a Midwestern so how about a high compression build similar to what you do but with at least 12:1 compression or more. I also really liked the poor man's 396 stroker, more of those please. Anyway just wanted to take a moment and let you know what your doing is very much appreciated.
I appreciate you watching ,I appreciate your input,, I've got that request several times about doing a high compression E85 street strip motor I'm gonna get on that. I got plans to do a 496ci 12.3 to 1. e85 motor , It probably be a couple months but I will get that video out, With dyno testing
I realized my mistake, my bad. I was talking to my friend Tony about your channel and I guess I had his name in my head🙄, that future build sounds great. I'm definitely looking forward to your channel growing.
Have you ever heard of Skip White Performance, they are out of Kingsport Tennessee. They sell parts and do machine work and they have what they call Bravo 335 aluminum BBC heads sold in pairs bare or complete and they seem like the best I've seen for the money, again not seeing them up close, who k ows, but they are selling them bare in pairs for $829 and complete depending on a hydraulic roller or solid package for around $1350, anyway it'd be great to see someone like Eric W. to give them a review.
Thank you so much no big deal at all,@@conservativecrusader80
I use skipwhite performance rotating assemblies oftentimes but i've never used any of their heads,, I've had good luck with that company
I should have mentioned the timing,, I'm not playing with the timing on these combinations. For optimal horsepower, we just set it at 38° on every single big block. Because that's what all the Medium compression hydraulic roller, big blocks want give or take a degree.
Great information. I would like to see the total timing that each cylinder head wanted and if you could also share the engine vacuum at idle, maybe in the description, this would be very helpful for those of us planning on building a similar combination. cheers
It's always set at 38 degrees, To keep the testing universal
Question, you ever run beehive springs on a hydraulic roller cam on a BBC aluminum head? If so what part number and any advantages? Thank you sir great videos
I've never done it but I understand you can
I use the 911- 16 valve springs on the very small hydraulic rollers I run the 929 - 16 on medium sized rollers and the 933 - 16 on the bigger hydraulic rollers
You know, I think most BBC oval port heads that are well prepared are good for 575-600 hp with a moderately sized hydraulic roller cam. Just never seen any of them do badly.
Nice comparison.
Hell, you can make 550hp on stock 781's!
I believe you're right ,,thanks for your input ,,thanks for watching
I believe you're correct,
You know, that would be a very cool test stock. Other than a basic valve job see what they would make on a strong motor,maybe 468ci?@Anarchy-Is-Liberty
@@dzperformance7360 how about trying a set of #820's or #292's? I think people are sleeping on those numbers. Their combustion chamber looks very promising for unshrouding the valve.
Wow those 781’s were impressive! Great vid, I’ll say it one last time, your gonna shit egg rolls if you ever get to dyno another build like that one with smaller tube headers!
The small tubes are better? 2”?
@@duc626 On a friends 462, small solid roller 10:1 Brodix race rite heads 1 7/8 headers picked up almost 30 ft lb over the 2 1/8 dyno headers!
Have you done a compression test on any of your 496 engines just curious how much pressure they make ? I’ll be checking my 505 that was run in a boat with Promaxx 319’s thanks I’m subscribed 😎🇺🇸
No on compression test ,,thank you for watching.
A stock 454 block can be bored as much as .125", 70 block, two bolt main... Has thick cylinder walls, I know I have one for my 468"... It is 4.310" and can go another .065". That is 32.5" per side...
That's the same information I have been told,,
@@dzperformance7360 good buddy...
That's a wicked combination
Very nice, wonder how much you could lower the duration on that combo using the 781 at 119cc without giving up too much power and improve low speed drivability for a 4-speed street car. Thanks, and Keep Rolling........
I was reluctant to show this combination. It's not that great if the cam had a little more Lift a little less duration on the intake and more on the exhaust. It would have made more power and been evan more drivable,
Hi dz, do you have contact info? I’m wanting some cam advice for my street 505 in my 72 camaro. Hydraulic roller and afr enforcer or promaxx 317 heads. 91 octane fuel. Thanks!
816 213 7204 Nick you can text me and I'll call you back if you want to talk about your project I'll give you my opinions
Whats your thoughts on 781 heads for a very mild cammed tow motor ?
They DZ, can you recommend a shop that ports 781?
@@deuceinfinity that's a tough one anyone that's good has got a 9-month weight
@@dzperformance7360 thanks, I have a 454 with a pair of 781 heads and it seems better money to have 781 ported and valved rather than spend the money for aluminum heads. weight is not a disadvantage and staying 454-496 cid shouldn't need more head cfm for engine rpm to get the job done. need to ask locally, someone will know how or who. Love the channel!
I am building a 505 now except it’s 12.5.1 compression 714in solid roller with a 1050 Quick fuel dominator I wonder how much more hp my combo will make than this my heads flowed in the 360s
👍
WHAT IS YOUR GAME ? .DO YOU DO THIS MOSTLY FOR FUN?, OR ARE YOU SAVING THE HOARD FOR BETTER TIMES BECAUSE THINGS ARE STARTING TO GET HARDER TO FIND AT REASONABLE PRICES. JUST CURIOUS. ANYWy good info as always. Have you ever thought of doing a 525 ??
My day job, I own a construction company,, But I have assembled motors for myself. Friends and family for over 30 years. Yes, it's mostly for fun, but I'm designing my own line of camshafs and carburetor spacers. Thanks for asking!!! Thanks for watching !!
When you say 525 what bore what stroke?
@@dzperformance7360 454 block bored 80 I think mabe 100 and I think 4 3/8 crank. I have to look it up. It will make over 700 with 700 torque
@@dzperformance7360 David wizard built one 727 torque. 800 horses. I just seen video. 4.5 stroke
yes , I have built those, That's too long of a stroke for a short deck. It creates too much windage. I've never produced any serious horsepower with those but they do make stupid great Torque,
My 468 makes 1.7 hp per cubic inch... 12.3 comp. BB-2 310 cc, heads. Regtangular ports, gasket matched to intake, Brodix round top intake with HVSS 2" 4 hole tappered spacer, 1050 cfm Dominator... 2.190" intake and 1.88" exhaust valve. Heads as cast.
Wicked combination
Wow thats really impressive. Can u run it on pump gas?
For a street engine do you recommend hydraulic roller, solid or flat tappet cam? I love your channel doing a great job o
Thanks for the compliment thank you so much for watching,, The only reason i'm using solid rollers in this test is just because it's what i've got on the shelf and it's easy,, For street strip use, I would always go hydraulic roller. A good name brand like Howard's. But I would never recommend flat tappet. They're a disaster,, The metal that use on those cams. Now you are guaranteed to have a flat cam very quickly,
Got a similar build can't wait to put my tunnel ram on it hope to see 700 hp
Cool make sure you let me know what it does
Its not a fair comparison... square port against oval port ! It should be square port against square port . But after seeing the result i would go with the 781 without all the sign writing
You're correct it's not a fair comparison ,,I'm just pulling stuff off the shelf doing all kinds of crazy testing. thanks for watching
Good effort tho ! Id like to see what you could get out of a 396 oval port with a cast crank, l feel that these engines are overlooked and underrated @dzperformance7360
Unles vortecpro did the heads your missing out big time, of course AFRs ar always better!
Yes!! he's the best around.
MY La Don... Not Mila Don
Sorry about that I will work on my vocabulary, pronunciation
Cool video! This is the stuff I'm into to 😎