B18A head
The gains made will be minimal unless you have a built block. Shaving is really for fixing a warped head doesnt make alot of power unless you have alot on $$$ in it anyways.
My friends have shaved their heads to 50 thousandths. Thats about as much as you can go and still be relatively safe.
You can actually tell a difference in performance
You can actually tell a difference in performance
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