Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
1977 454 Quadrajet Secendary issue, pop back fire rough running.
Jeff K:
Here's what I'm ready to buy. I want to use the stock 781 head valve spings..
Cam- Melling 22216
https://www.summitracing.com/parts/mel-22216
Lifters- Chevrolet Hard Faced #12371044
https://www.summitracing.com/parts/nal-12371044#overview
Summit Standard Timing Set W/gears
https://www.summitracing.com/parts/sum-g6511
Fel Pro Gasket set.
https://www.summitracing.com/parts/fel-260-1009
Isky Rev Lube.
https://www.summitracing.com/parts/isk-rl-1
Thoughts?
Cliff Ruggles:
Looks good as long as the lifters are really hard faced and USA production....
Jeff K:
Thank you so much Cliff!!
By the way, the old 462 is living by you in Lancaster, Ohio.. It has to have close to 100K by now! I almost flipped when the guy who bought it said, " I'm looking for a 60s street rod to take the kids to Dairy Queen in. I knew he was the right guy after hearing that LOL!! ".
Jeff K:
Hey guys will I need new lifters with either the Melling 22216 or the Summit 1301?
I'd like to keep the stock springs and just change lifters and cam.
My engine is a 1978 454 with 336781 heads all stock.
The Melling 22216 cam's specs are;
Duration @50 exhaust 218
Duration @50 intake 214
Lift W/stock 1.70 rocker, exhaust .496
Lift W/stock 1.70 rocker, intake .476
The Summit 1301
Duration @50, exhaust 218
Duration @50, intake 214
Thank you!!!
Lift Exhaust .501
Lift Intake .502
Jeff K:
Sorry for the error, I meant will I need new springs with either cam. I really like the Melling 22216!! I got a lot of good feedback on both. Everybody says as long as the lift is at or under .500 Im good.
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