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  1. olds97_lss

    Difference between big and small block?

    The crank case is longer and wider physically. Carb is typically larger on a big block as is the exhaust port. This is an old photo I had of a Omega 21 big block (top) and an OS 18 small block (bottom):
    • olds97_lss
    • Post #3
    • Forum: Nitro RC
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