Yes u are right there is two different styles..(maybe even more) dont know do we.we I have read that everyone's BBK fail prematurely due to either overheating of engine block in that area, or piss poor build..(mine will be redneck built) lol.so I have decided to mill off material of the bottom of the piston sleeve. Even if I mill mine it will have just about same as what's coming off... And if it don't work well hopefully block will hold up to piston over heating sleeve. I'll keep all posted....
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