Originally posted by MikeSarr_GSR
B16a head, LS block/89mm stroke, JDM B18C Pr3 piston = 11.3:1
on c-speed's com calculator and 11.6:1 with a two layer gasket.
unless this page isnt reliable, I would say it is possible. if you had a GSR head, you could see 11.57:1 on stock HG =)
http://www.c-speedracing.com/howto/c.../compcalc.html
PR3 pistons are USDM b16.
You could also use JDM ITR (p73-00) pistons and get the same compression results, with the little added nicknacks you get when using R parts.
Plus, ITR and CTR pistons are bought and sold in such quantities that they really aren't any more expensive than those b16 pistons.