Hi, this is my first post to this forum, thanks for having me!
I bought an rb20 head and am wondering if it is acceptable to use it on an rb25 block.
My concern is that the rb20 head has a combustion chamber sized for a 78mm bore and I would like to use it on an 86mm bore block, do I need to port the chamber to match or is it okay to have the chamber overhang the bore? From the factory it had a flat top and bottom overhang so I assume it would work around the whole circumference? Thank you for any advice
