Hi again u guys,
I put my 540 project off since last year, now I am getting interested in it again.
I have a bowtie gen 6 block zero decked, and a 540 balanced rotating assembly consisting of an 4340 eagle crank, 1 pc int balance, h-beam rods, and SRP small 10cc dome pistons.
I wanted to run factory iron heads to make the motor look stock, found a nice LS6 pair on ebay awhile back, they are casting number 3994026. They intake volume on these heads is approx. 320-325 cc's. I cc'd the chambers and found approx. 114 cc. Stock they are 118cc, so it looks like they've been shaved. If I assemble the motor now, the static compression comes in high at 10.7:1.

At this point I think I can either change out the pistons to flat tops and rebalance the rotating assembly, fly cut the tops off the existing pistons and rebalance the rotating assembly or just get different heads with a bigger chamber. Any suggestions. I am leaning toward a gm factory iron head engine, since it's going in a '70 vette.

So now this leads me to wonder just what is a good target compression ratio for this size engine that's been zero decked and has iron heads?
Thanks for your help, Ed