So I picked up a set of 317s milled down to 64cc. I'm running a pretty big cam. It's 230/243 duration and 630/610 lift. This is in a SBE ls1, I'm just curious if anyone else has run a similar setup and if you had to fly cut the pistons. Thanks for any input guys, I did a search but didn't find a lot.

 

i put a similar duration and lift tick cam with a 113+2 LSA into a stock lq4 for mock up
didnt come anywhere close to hitting, but it's best check with clay to be sure.

without your actual valve events it's a gamble. two cams with similar duration @ 0.05" and total lift can be night and day different.

usually you get into trouble when the piston is coming up chasing the intake valve as it's closing.

 

that gives me an idea for a software program that lets you enter in valve events and watch a transparent 3d model of the engine turn over. that'd be dope. I'd pay some money for that.