Why go thru the trouble of milling the pistons down .040"? If thats what you want to do, just put a thicker head gasket in. I have run head gaskets up to .165" before, MLS Cometic. Hell of a lot cheaper and easier than pulling the whole engine down and milling pistons. This is exactly where I have been heading. The piston milling idea is just something I may consider in the future.
Anyhow, just so some of us dont have to read for 2hrs, give us your basic combo so we can help
What stroke 4.15
What pistons, p/n and specs Ross 94998 Flat Tops with 6cc valve reliefs
What is your piston to deck clearance? Pistons sit .017 below deck
What heads, Edelbrock with 84 cc chambers
What cam and where is it installed, what ICL, Lunati 316/326 solid Degreed to 106 as per cam card.
What exhaust 2" TTI headers, 2 1/2" pipes, Flowmaster 42451 mufflers, tailpipes.
What intake Edelbrock Performer RPM
What size carb Grant 850 VS with 86/94 jets and a 3.5 PV
What dist are you running? MP electronic, Chrome box. 2 Brown springs, 16 initial, 30 total. Idle @ 1000. Curve begins at 1350, all in by 2350.
