When building my crvtec I was originally going to go with 11.0:1 cr pistons with a b16a pr3 head. Eventually I changed it to the GSR p72 head. I already had the pistons for 11.0:1 for the b16, so I used them with the GSR head. I was just wondering how much the cr goes up with the GSR head. I've heard it goes up .2 and .4, but never got a clear answer. Anyone know?

 

With stock bore size, it will change it by about .23 cc's.

 

thanks