Senior Tech Team
Join Date: Aug 2002
Location: Gold Canyon, AZ
Re: Symptoms of blown power valve
A blown power valve will make the engine very rich at idle and adjusting the idle mixture screws will probably make no difference in the idle speed. Have never had a blown power valve cause popping though, could be that you have other problems too.
64 Chevelle Malibu Sport Coupe (original owner) car now has 427" BB, Jerico 5-spd. trans., Dana 60 rear end.
SAE Member (25+ years)
ASE Master Certified Engine Machinist
AERA Certified Professional Engine Machinist