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  1. Vintage iron

    M923A1 Coolant in Oil

    Good thing you caught it. Cummins hate to be lugged and the Allison will bring the RPMS to low. Always keep the RPMS between 1500 snd 2000. It was probably the o-ring at the bottom of the liner. Mine did the same thing. But I put a Big Cam 290 in mine ;)
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