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  1. Hammer510

    Timing for 1990 liberator 221 w/454

    So my boat has the spitfire EEM ignition system. I just converted my engine (744APEPWS) to a roller cam and I was wondering if I will need to adjust my timing, and if I do, how can I adjust the timing on the spitfire system? This is also my fist time doing heavy engine work, so be gentle. Lol
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