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  1. How to tell the difference from GEN 5 to GEN 6 454

    Engine
    I was pulling parts off the 454 today and the whole time I thought it was a Gen 6 block. I pulled it from a 99 chevy 3500 suburban. I was looking at the #'s on the block, and in the back side in front of the flywheel it says MK H-5... So im thinking it a GEN 5 block??
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