I have a +4 stroker crank and a 94mm vertex piston,just got it all back together and it sounds like my valves are hitting the piston,hot rods says you can use any piston with this crank but now I wonder, Kevin
11.3.1 comp 93 and octane booster,and it's not just a ping it is a knock, going back to ltz base gasketWhat octane are you running? Did you put a high compression piston in it? Mine would just ping slightly under heavy load off idle on 91. Ran perfect other than that. 12.5 to 1 piston. I put the regular gasket back in, to get rid of that slight ping and help it start easier.