mydooris4 Posted 2 hours ago Share Posted 2 hours ago (edited) 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 Edited 2 hours ago by mydooris4 Quote Link to comment Share on other sites More sharing options...
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