Compression ratio
 

Hi Scooby m8:ts. As some of you know, I`m building a 2.5 liters EJ257 on my EJ20 Wrx RA 1996. Im using the Wrx RA cylinderheads with the block.

To my question. I bought a engine with complete gasket kit.
My old cylinderhead gasket was 1.5 mm, and the new one was 0.9mm. So the old one was 0.6 mm thicker. Do you think my compression ratio is going to be to high? Want to know this before putting all things together, and before remap. Shall I go buying a thicker headgasket for 180£, or should I be just fine?

Thanks