what other ways are there to raise compression besides pistons and a thinner head gasket. i have a b16 head on gsr block with jdm itr pistons and compression should be low 11's. what else could i do...i want to be around 11.5 11.6

 

thought bout milling the head?

 

mill the head or resurface. i think flat faced valves may help, but not much at all. um... get a gst head. thats all i can think of. theres something you can do to the cumbustion chamber, but the name escapes me. its called something like, closing the combustion chamber, or clovering the cumbustion chamber... i dunno, maybe ive had too many

 

Another way would be to use a GSR head instead of a B16 head, smaller combustion chamber = higher compression ratio.