i have early model 454 in a gmc pickup. I run premium gas. I have a
compression ratio of 10.50/1 my cam is advanced 4 degrees but no
matter how I have the timing it pings at hard excel. I have almost all
spec for my cam size( intake lift 0.475in exh lift 0.500in)( intake
duration 264.0 exhaust duration 274.0) my piston are 230 domed sealed
power fordged
