Chevelle Tech - View Single Post - Need Help Diagnosing Popping
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post #12 of (permalink) Old Apr 17th, 19, 8:16 AM Thread Starter
Tech Team
Join Date: Jun 2013
Location: Boston
Posts: 756
Re: Need Help Diagnosing Popping

I didn't have enough time last night. All I was able to do was a cold compression test. And all the holes pumped up to 175-180. I pulled the valve cover too and the rockers were pretty loose. I can't imagine a valve being held open at all.

Bill, if I can find a helper I'll try running the rpm up and seeing if theres still popping

67 Chevelle 454, M21
Gen IV 454 (out of C30 ), 390 heads 1.88/2.19 valves by Vortecpro, with ISKY Hyd Roller cam (at 050 218 int./228 exh, lift 530 int./552 exh.), RPM performer intake, Fitech 600HP, Dougs headers, and M21, Gear Vendors OD, 3.73's, UMI Suspension, Viking coilovers.
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