engine pinging

Got questions?  We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we’re dialing in timing and straightening out a few cam/valvetrain issues.. D.B. • Basom, NY Q:  I own a 1977 Chevy 1/2 ton 4×4 with a 350 engine. I’ve had the engine bored .030 inches over, installed flat top