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lmm heads
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  1. Duramax Fourth Generation: 2007.5-2010 (LMM)
    I like to know if you can use lmm heads and the whole Complete top end on an LB7 short block I have Heard you can use Lbz heads on a lly and what not but would like to know if it is possible my crank broke in my stock lmm. I also know the Compression ratio is different on Both motors did t know...
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