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Hot Rod 4x4 Down On Power After Heads/Cam Swap!
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- Опубликовано: 9 фев 2023
- I did a heads/cam swap on the ol hoopty 4wd a couple months ago and it never ran like it should. In this video I attempt to figure out what's wrong with it.
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This channel is quickly becoming my favorite channels. It's more down to earth and closer to what my real experience has been thus far. Keep em coming!
Preshate it.
If it still has the stock harmonic balancer, it may have slipped some. The outer ring can slip on the rubber and cause the timing mark to be off. That would explain the timing being at 42 degrees and still possibly wanting more.
That big cam needs a 3000 stall converter and lower gears in the rear. If it were me I wouldn’t have installed anything over 268 duration in a street truck but that my own recommendation.
Yes sir another Friday night with Chad!!! Be safe during your travel!!👍
Woo hoo!!! Let's get it! Hope y'all have had a wonderful week! 💙🙏🏼
Good to see you fella
properly tuned and on the right engine mix, there's nothing wrong with a Q-jet. Love them for SBC's.
Fuel pressure is fine.
A stall converter will help maybe a 10 2500 to 2800
Sound like an intake issue. Maybe a big spacer between the carb and intake ? Help distribute air mix at higher rpm? Or maybe it's restricted with the carb/cleaner
Good gravy pops. My little brothers Chevy Camaro Does the same darn thing. Tried carburetor. Timing. Everything you did pops. Same results. I really was hoping you found it so we could have tried it. Well keep up the great work
An adjustable spay bottle (set on stream not spray) and squirt water on each header tube close to the head and look for a difference in how quick the water burn off each header. That's a good way of looking for a dead miss/cylinder.
I'd recheck the cam timing. A good start is a vacuum guage. It runs like it's a tooth off. Good luck!
Boy, if it wasn't for bad luck, you wouldn't have any luck at all. Welcome to the club! Good luck on your trip. Another great video. Keep up the good work.
Thanks for showing us the stuff that goes wrong too. It encourages the rest of us who also have bad luck running in our families!
If I didn't show that I wouldn't have much of a video! 🤣
Great video I'm glad you figured it out I really like that truck, I just got back from Tampa, brought up my cousins 53 Belair up to Clarksville TN for him, using my 03 F150 with now 294k miles lol
Yes glad to see you!Love love the videos you put out!Hope all's well your way!Can't wait to see you get garage done!!!!
The comp 280H cam is my favorite cam, maybe a spacer between the carb and intake would help
I have a 383 that my dad built in the 80s that has the Comp 280 magnum cam. It's like 12:5-1 with dome pistons and a set of worked 186 casting heads with big valves, lots of port work. It's in my old pickup now and runs on E85.
@@Bobthebuilder.69 I also built a 383 in 1990 and put the comp 280 in it, I had a Edelbrock performer intake on it with a Holley 750 I also had a set of double hump 327 heads that motor made tons of torque! Btw it had the 400 rods in it, later on everybody started using the 350 rods.
@@mitchchandler8243 my dad had this motor in a Chevelle in the early 80s and a few years later, he replaced it with a big block, so it has very low miles. It sat in dads garage wrapped up on a engine stand for at least 30 years, I talked him into selling it to me about 8 years ago. Within a few hours we had it running again, I couldn't believe it. It sat at my house for 5 years 😂 but when COVID hit I got laid off for 3 weeks and I put a new set of gaskets on it and dropped it into my 85 Chevy that had a worn out 305. It has a 1980s Edelbrock torker 2 intake a new Quick Fuel E85 carb. I went with E85 because the motor makes a little too much compression for this crappy pump gas we have today.
@@Bobthebuilder.69 mine was in a 1971 nova which was my first car, a few years later I bought a 70 Chevelle SS 396 but it had the exact 383 I had in the Nova but with a set of Chevy bowtie heads I sure wish I had that car back lol
@@mitchchandler8243 good times. Gotta love a small block chevy
Chad ur the all time king a single recking crew
Bringing all these dead vehs etc, to their 2nd life to live once again…
💪🏽👈🏽
👍
Should run the trans lines through the radiator cooler then the air coolers cooler. Keeps it warm in the winter and the aux helps in the summer this is how the factory runs them
I don't live in Alaska so no need to keep it warm in the winter.
I have had the same issue with my 302. Ran the same hei you have (from chyna) and it acted the same way.
Enjoyed the video sir
Out of everyone I watch on RUclips this channel is easily top 3! Keep up the great work.
Preshate that a bunch! 👍
If you haven't already ordered lifters, I can say that ls7 lifters fit a sbc they are cheap and very good.
Dang I sure don’t like seeing new lifters being bad because it’s a big possibility that it has or will wipe out those cam lobes. I know for a fact that the old crane 270 rv cams worked great in a 350 Chevy. They might not bump the idle that great but they pull good down low. If memory serves my old brain I think it was 270 duration and 470 lift with either 106 or 108 lobe separation.
Good video Mr Chad. I bet you found the problem this time. keep working at it. We will watch.
To me it sounds like your cam is a little bit too big for the bottom and you're looking for! Although maybe you want to try a one inch spacer on your manifold and a manual curve kit on your distributor. I'm not a motor Builder either but the way that thing is laying down when you first kick into it it's almost like it's expecting more RPMs right off the bat. Anyhow I'm sure you'll get it you know I always wish you the best
Maybe you missed the intro talking about the dyno session with basically the same setup making pretty decent power. The laying down you hear is typical of a quadrajet.
Chad, hands down for me, u have the best channel on youtube, absolutely love watching ya and indeed listening to ya..... keep it country my friend, and by the way, greetings from Ireland 🇮🇪
Hello Ireland and preshate the kind words! 👍👍
Great job! Blessings from Texas
I hope u put that Holley back on it. I was thinking it was loose valves. Lifters it is. She'll be ready fa da nxt trip.
Be careful on your trip!
You're my most favoriest mack-a-nack! Look forward to each video! See ya next Friday!
👍👍
The crushed fins on the condenser is the reason your truck overheats while towing.
Excellent video Chad :) also on temperatures gauge did have silver one not copper on sensor check that maybe problem too and hope get both them fix up to soon ! Be watching to and hope post them up !
The same with one I had. Did a Harry's HOT Rod Shop swap on a 65000 volt distributor. Efi to a quadrajet was incredible. Smooth and quick
I did one time had the same problem with lifters and was so frustrated that I was going to junk the truck an old friend mechanic said he could do it with out pulling heads he had this long claw looking thing on a cable and he removed rocker and push rod also had pulled distributor and put one cable claw in threw push rod hole pulled out lifter them grabbed it with another one threw distributor hole and pulled it right out threw there I was amazed and he did the same move in reverse to put it back in had the whole job done in a few hrs at very little cost
I had my TBI motor I did a cam and head swap on drive me nuts cause it never ran how I expected it to. I could never pull more than 11 inches of mercury and it always ran like a dog and it took so much timing to be happy. I eventualy put a FI tech fuel injection system on it and it managed to make my random mess of parts actualy work really good.
Did you ever replace that dodge brain thing and check the grounds and wires too It?, Just curious , maybe I missed that video showing how you checked, and if that's the case, sorry Dude, anyway love your Gig and thanks, Thumbs Up!.....
I can't wait for next week to see how that runs after you get them lifters
Slow and steady gets it done , you have been up and down that truck every which way till Sunday and finally come up with an answer that will make some sense . God Bless you and your persavereance for sticking with it , Lord God let this be it . Till next time Stuart in Ontario...................
Time will tell if this fixes it!
Years ago I had a 1991 Dodge power Ram 150 with fuel injection that did the same thing as your truck twice. Once was cheap plug wires, the second time it was the plug that connected to the small box computer on the sidewall. I ended up spraying a bunch of WD40 on the plug and taking a light wire brush to clean off the small prongs on the connector and it worked for years afterwards.
On the cooling issue the first thing i might try is a laser temp gun to make sure the gauge isnt lying part of the time. If it is for something cheap swap the cooland sending unit out.
Did that a long time ago. No heat from the heater also says it's not warming up. I'd love to figure that out and get my heat back!
A stall converter and recurve the dizzy would probably help a bunch.
Possible getting a regular performer intake instead of the high rise dual plane also.
I’d recurve the dizzy to around 20 degrees initial to about 36 total
@@tetedur377 torque converters are tricky on trucks ….too much stall can get ya in trouble over heating the trans if you tow with it.
Lock up helps but a trans can heat up quick just driving around town with too much stall…..depending on the gear ratio I’d run 2000 or 2500 max
Converters don't make HP. This truck is making no power anywhere in the rpm range. This is not a high rise either, just a plain old vortec performer. RPM range on this intake is idle to 5500.
@@ThisNThatGarage correct , convertors don’t make HP but a larger than stock cam does change power band. Anytime ya add duration it affects low end torque characteristics! Gaining mid range torque and higher rpm Hp usually is a trade off with losing low end torque!
Many later model vehicles had a 1600-1800 stall speed. Killing low end torque makes it worse! Even a 2500 stall would make a noticeable improvement in acceleration…higher stall allows the engine to reach the useable rpm range easier!
I get it that there’s way more tuning that can be done to improve performance ….but I’ve found over the years a properly match stall speed makes a world of difference ….a performer rpm is taller than a regular performer …performer rpm intake are typically rated 1500-6500 where a performer is rated idle to 5000. Again …the majority of the bugs your dealing with could be tuned out but it’s possible your battling against parts combinations.
Any cam with a lobe is gonna experience low end torque loss!
I’ve experienced these issues myself many times over the years ….just throwing out some possibilities if ya run into a dead end!
The collapsed lifters your dealing with could be your whole issue….hope that’s all it is! Not sure why the engine isn’t clattering a whole bunch with that much slop…maybe they pump up once it’s running? …idk…good luck
@@markcole6475 I'm completely aware of how cams and stall converters work work. Maybe people misunderstood me but it's not a matter of where it's making power, the motor is not making any power at all. I can stall it and gear it til the cows come home and it ain't gonna make it any better. 👍
@@ThisNThatGarage ah….I see..I was under the impression it was stumbling/bogging at low rpm from your audio while you were test driving!
Guess with the exhaust noise I didn’t hear exactly what you were saying! I do remember you saying on WOT runs that it wasn’t too bad and pretty decent power! So I guess that’s where I got my opinion from just being a low end issue!
I recall you comparing the build from “Engine Masters” being very similar to the build you have! Which should be similar in power!
Thats probably true but I have watched that show also and they all have made many comments about some builds when they do mods that it’s unclear what drivability would be like in a light weight vs heavy vehicle!
Chad!
If you ever find that your driverside tail light no longer works, or becomes faulty, it is the Circuit board for that tail light. Chevy screwed that up! The gasket and sealing for the assembly is awful. Junkyards carry them, and I sprayed moisture sealer on the board of the replacement one I got. I had a 96, with the Z 71 flavor, and 4x4 package. It came with the factory skid plate on the front under carriage.
Loved that thing!
Stop buying cheap Amazon parts . Lol you are a great mechanic sir. You are very entertaining too. Keep up the good work sir.
Send me the money and I'll buy whatever parts you want.
Another fun Friday with Chad keep them comming love the channel Have a safe trip
I love quadrajets I've never liked hollies they've left me stranded to many times
I always had to replace the module on the 2 or 3 after market GM distributors I've replaced in the few years. Those after market modules always failed after a few months. I finally bought a few NOS GM modules on eBay and an NOS rebuilt GM distributor just to keep as spares for my 2 square body trucks.
Hey Chad, I had a 91 chevy 4x4 with the throttle body 350 do the exact same thing with the temperature. I did every replacement you did without fixing it. One day the temperature was reading hot on the temperature gauge so I used my laser temperature reader on the thermostat housing and it showed the temperature at 188 degrees while the gauge showed 225 degrees. The temperature sending unit in the head was faulty. I purchased a new AC Delco sending unit and the gauge never did the crazy fluctuations anymore and the motor was never running hot. If you've already replaced the sending unit then disregard my comment. If you haven't done this try to get an AC Delco sending unit, they are far more accurate than your typical replacement at the local parts house. 🇺🇲👍
I swear watching your videos always makes me laugh and I like how you 4x4 sounds sitting there lumping
Q jets are my go to carb.
Maybe power valve needs to be changed to a 45 ?
Also make sure your lower rad hose has a spring in it !!!.
Great channel...!!!
Check the center bolts on the intake make sure there not long. Because if they are there running against the push rods.
i once chased a issue like that.. feul pressure, pump topped out before carb went clicky klack and all was well
I’ve seen other mechanics use an electronic temp sensor you can buy at atores to check the temps on each header to make sure of even fire
Waiting for the next video on lifters. Inspect that camshaft real close for wear too. Also make sure the push rods are the exact one for that application! Doesn't have to be off very far !
Chad, you don't give up until it's right. That's the way it should be!
I can be hard headed and stubborn! 😂
I had bout that same Amazon distributor and never got my truck to keep time or run right so I got a used distributor and New delco cap and button fix my issues
Chad you have struggled with this truck. Hope you get this figured out! Love the effort, and the video! ❤️💯 Wow so collapsed lifters. Whew.
Make sure the heater core is not bypassing the thermostat.
Glad ya found those sleeping lifters! Its hard to watch ya struggle all by yourself there and rack your brain for answers! Good job as always, cant wait to see it fixed.
Hopefully that fixes it!
Glad you figured it out. Cannot for update after fix👍
you might have one of them KUALITY Chinese dizzy's
,
glad you changed it to a better quality one
You really should fix those condenser fins it definitely will restrict airflow, glad you found the problem in the lifters!!
It's always something! Nice work This N That!
It sure is!
that ol' Chevy sounds so good, even if she was runnin' rich there at the start lol
Your picking up your rafters down aroud my neck of the woods. Safe travels.
Thanks again for all your hard work for making these videos they are very enjoyable and inspiring I look forward towards more excellent videos 🤠
Those fins on the condenser are so smashed that air flow across the whole radiator will be compromised.
Love your videos
Have you tried using a carb spacer? Also are you getting enough air into the engine? It does and some donkeys using a better intake and filter. Since with the cam it wants more air.
I have been the same direction as I was saying last time my last vehicle was a early 94 Chevy k1500 Silverado extended cab short bed Z71, and 87 Chevy p30 350 tbi bored 0.40 over but severe lack of maintenance for the truck, I had pulled out the ac Delco distributor it was rusted inside, and I bought a ateam performance tsp brand new billet aluminum housing tbi distributor and put it in the truck, along with a brand new set of napa 7mm belden heavy duty silicone core plug wires and it constantly had a miss and snapped and backfired letting off the gas and I changed the ngk v-power ur5 spark plugs to a set of autolite platinum spark plugs and it would foul those out quicker than the v power plugs, and I bought a ac Delco ds194 ignition control module and put in the aftermarket distributor and it quit misfiring and fouling out plugs and I put a brand new set ac Delco r45ts spark plugs it runs great!! The ignition control module I pulled out of the aftermarket distributor has no part number no dielectric grease on the back side of the module and the the top two pins were bent.
Great video! Seems like possibilities for problems always outnumber ideas on how to find them.
Yep, nothing like the endless hunt for the source, and finding it!!! Lol. Good on you Chad! Cheers!!
Well I've heard lots of people complaining about getting crappy new parts... Be careful what you get..
They just don't make stuff like they use too..
They sure don't.
Enjoyed the picture show.
So with my camaro I put a 160° thermostat in during the summer and as soon as it starts getting into the cold season, I install a 180° thermostat. In your case I would install a 195° thermostat 👍🏻
Headers have a great diagnostic advantage for a rough cylinder contribution test. using an IR gun, measure each header temp at each exhaust port.
My old Chevy done this... I come to find out the water pump impeller was spinning separate from the shaft. I put card board in front of my radiator too.
If timing lights from harbor freight it's junk so that's probably the trouble!
Spray the vacuum advance control with some PB-blaster.& Set the timing to the lowest of the two numbers.,or the highest of the two numbers.
Yeah back to trucks!!
I like 4 wheelers and stuff but cars and trucks are where it's at!!!
Just a reminder that it's called This N That Garage. I get into a little bit of everything.
from my rookie understanding idle performance is your idle mixture screws, transition from idle to acceleration is your accelerator pump and squirters, and driving/cruising is your primary jets. so your stumble could mean your accelerator pump isnt delivering enough fuel fast enough. that could be the accelerator pump itself or you need bigger accelerator nozzles to deliver the fuel faster
Changed the nozzles multiple times with no effect.
Gotta love that tn weather 29 one day then mid 60s the next
MLS strikes again. Great content sir.
I would be checking the compression rings for sticking, Under a load as your pulling a trailer. you put more force on the rings and thus get blow by.Which in turn causes more heat to the block and over heating And as for the timing, check that your block gauge and the balancer are correct Aka in good shape. An those after market distributors are bad They will fail after 10k due inferior material. I would bet that the Holley is just fine just need to stop the flooding at idle. (the stall at take off). this just my observation only been wrenching for 35 years.
I have a 90 Chevy Silverado with a 5.0 and my temp gauge does the same as yours. It only does it when the humidity outside is high, like when it is raining or wet snow. Otherwise gauge works normally.
Great catch on the lifter issue!!!
I'm shiming my lifters on My next cam swap I believe.
As in the water jackets port holes if their clogged up at all will cause those same issues to.
Nothing like a good motor mystery! Lol
Hey Chad, I forgot to mention this and I don't believe I've heard you mention it, if you have just disregard my comment. Have you checked to see if the clutch on the cooling fan is wore out. That could explain why it overheats when you pull something. With the truck running at operating temperature, watch the fan when you shut the truck off. If the fan rotates only 2 or 3 times then it's good but if the blade spins freely when you shut it off, them the clutch is toast.
Keep on keeping on. 👍👍🇺🇲
Checked it awhile back and I believe it's on its way out.
I know one more trick tip on that truck of yours to for ya. It's called if it's got A honey comb air massive flow sensor on that air induction vent it could be dirty. They have cleaner spray for that to Bud. Spray down good let it dry out really good. Then try it.
Man i love your videos, it always puts me in a great mood when im upset with something
Glad to help. 👍
Break out the Gas-ka-leen Chad and set it on fire sir! You are one of a kind sir! Hope y'all are good!
Running rich maybe? How tight is the timing chain? The change in timing is suspect. I would get a good GM distributor in there.
I do believe it's that dang purple tint you got there!
I love seeing you & your videos
You'll get it.
I keep thinking, if those lifters are hydraulic rollers, might you have low oil pressure?? OR, if the cam is too big, might the lifters/rockers be "at" the bottom out point, and those few got smashed?? Definitely looking forward to your getting to the bottom of it.
Oil pressure is great.
Love the channel and all you do I do my own mechanic work and you have helped me a lot. Hopefully the lifters will give you the power back. Be safe on your trip and God bless you Chad. Can't wait to see the garage going. 👍👍
I had a 89 Scottsdale it was the same way it never wanted to heat up. I changed everything as well.
Sure hope I can figure it out eventually!
Is that a single plane intake? I’m not a professional engine builder either, but I have built them and did a LOT of research. Everything I read said that single plane intakes are no good for mild / street engines. They don’t make any low end torque.
Sucks about the lifters. I had that happen to me with a ‘performance’ set once. I also got burned on a Chinesium distributor. Agree with you, Mallory, Accel, MSD or nothing!!
Love the video and the series on the pickup! Great channel!
When you were running it with the Holley in the second run after the jetting, it looked like it was making decent power and sounded sweet.
No sir, it has never made decent power since the cam swap.
Love the videos. Safe travels