Ok heres my question and then I'll post the details.

Will I have to get new pistons if I change heads ?

Block is a 2004 LQ 6.0:
Bored .030 over = 4.030 bore
Callies 4.00 stroke crank
Callies 6.125 rods
Wiseco Forged dish pistons - -15cc and with the heads I have with TEA stage 3 317 blower heads it would put my compression ratio about 9.2 to 1 with the 74cc and would clear the 2.10/1.60 SS valves

I've been thinking about running an LS3 style head though and have heard a lot of people are having to flyfut pistons to use them. My setup is a turbo and I do not want to fly cut them - but I could replace them now before my motor is built.
Back to my question - will I have to - from what I under stand LS3 valves are 2.165
.065 larger than my 2.10

I do not have a cam yet - I know that makes a big part of the puzzle , but it is literally the last item ( unless I switch heads ) that I need to buy.

Hope that makes sense , trying to figure out math like this is not my strong suite.

 

Nope you're fine. Wiseco cuts their valve reliefs to use any OEM style cylinder head.

 

pic of the piston

 

Thx KCS - I was pretty sure they would but needed someone else to say the same.