I went to the C-speedracing.com website and used their compression calculator. This is what it gave me.

USDM B18B block (81.50 mm bore)
B17A head
Stock 3-layer head gasket

Pistons:
p73-A0 (USDM ITR) - 11.8 CR
p73-00 (JDM ITR) - 12.4 CR
pct (CTR) - 13.2 CR

Are those correct? I just want to make sure before I go get a set of USDM ITR pistons for my LS/VTEC. What is needed to be done to the rods to make the pistons fit on Eagle B18B rods?

 

Ok, I wa just reading thier LS/VTEC buildup and it says that they used the B17A head and the P73 pistons and that gave them a 10.9 CR. Whats going on here?

 

Bump, hopefully the real tech guys come out at night.

 

I went to C-speed and ran your numbers and came up with:
P73 (USDM)-10.904369584307167 : 1 C/R
P73 (JDM)-11.42006109553134 : 1 C/R
PCT-12.084251817988063 : 1 C/R
Note: I used the piston to deck height of OEM B18A/B/C1/C5 - B20B/Z.

 

Thanks alot. I must have just scrolled part that section. I thought my numbers were a little high.