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the compression on the b is like 8 and the z is 9
either way its fine.....not like its that imporant though...the sleeves are what is going to kill it (at that point of changing those you could make the compression whatever you want with pistons, headgaskets, etc)
hmotorsonline sells good longblocks or try local
youre going to have to use an LS intake minifold though
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