have a b18a block with b16 pistons and gsr head that will yield me 11.5:1 cr with an oem headgasket that is .03" . ive searched and cant find where to get a thicker headgasket than that. basically , i wanna boost (low boost 5-7 lbs) but need to lower my cr. anyone know where i can find thicker headgaskets? and what u think of boosting that block :/

 

Cometic sells a taller head gasket.. I got a .053 one for my B16 which took the compression to 10:1 for boost..

 

Cometic sells a variety of sizes. I ran a .074 on mine and it lowered compression from 12:1 to about 10.6:1. I never had any problems with it.