I'm wondering how many cc's can be removed from a 76 cc head by flat milling before the intake won't seal? Rules state that the intake side of the head can not be machined and can not helicoil the bolt holes on the head changing them from 3/8” down to 5/16” so you can move the intake around. Just exploring the new optional IMCA stock car engine rule.
Thanks
Jeff Verdoorn
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