Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

1977 454 Quadrajet Secendary issue, pop back fire rough running.

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von:
That Melling cam is a pretty close replica of the GM Chevy LS-5 454 and L34 396 cam. Duration at .050 and LSA are the same. Lift on the GM cam was .461 int and .480 exh.

Jeff K:
Thank you Von.

Jeff K:
Well I got a cam and lifters from Melling. There a small chip out of the cams mid bearing lobe. I'm not sure if it matters. I'm not using the lifters. They say made in Mexico on the box, kind of strange for Made in USA parts..

I have a guy on the Chevy forum that makes and sells cams and will sell me a set of USA made lifters. The cam doesn't say Mexico just the lifters.

Thanks for all your help guys.
This is a shame I got to come over here and bother you guys with this cam stuff. But I've bought a few things from Cliff and your the only guys I can trust..

Jeff K:
The cam.

Jeff K:
I wanted to clean this all up.
 I took the cam and Mexico lifters to my motorcycle machinest and he looked it all over and said both are fine and the machine work on the cam is actually pretty good. 
I still sent it all back and bought the more expensive 22216 Melling cam that was suggested in the first place and $200 lifters from GM. It should be here today and I'm all ready to go..

By the way Melling specs there lift at 1.76 rocker ratio but the 454 Chevy uses 1.70. So I got to drop the 22216 cams lift spec down from;
Intake .476" to .479"
Exhaust ..496" to .479"

Next will be the Quadrajet rebuild and I finally get to spend some money with you guys LOL..

Thank!

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