hondahead2020

new to honda tech might be in the right place.
i have a b20b bottom end with b16b pistons and a p73 gsr head that’s been milled .008.the head is built with type r cams.my questions is does/if someone has a similar build anyone have a recommendation on what thickness of a head gasket to use.i’m trying to get away with just a little conservative build and using pump gas. but afraid the compression ratio will end that real quick.not looking for crazy power yet just some decent gains. thanks in advance

JRCivic1

Factory Honda B16B pistons do not fit a B20B block... what brand of pistons do you have ? Pistons with domes that big in a long stroke engine will make really big compression... not a conservative build at all. Assuming your head has in fact only been milled .008", you will need to use a head gasket with a thickness of .040" to get things back close to the stock geometry.

K20.ek

P73 gsr head... 🤔 must be new hybrid.

hondahead2020

nippon racing

hondahead2020

typo 😅

90da4dr

What size are they. For a b20 motor you need at least 84mm pistons at stock bore.

hondahead2020

its all put together correctly. just wanted to know if there was a recommendation on a size head gasket

K20.ek

84mm oem or je pro seal mls headgasket will do just fine.