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  1. #1
    Platinum Member Platinum Member 26sonic's Avatar
    My Boats:
    boats, cars
    Join Date
    Feb 2001
    poughkeepsie, ny, usa

    engine timing question?

    am planing on installing one of the efi kits on my 1998 502 mag efi this week . was told by both manuf. to advance timing from 8deg to 10 deg , my question is if i already run 89 octane fuel do i need to go up in octane ?

  2. #2
    Charter Member #1055/Moderator Charter Member GO4BROKE's Avatar
    My Boats:
    Sonic 386
    Join Date
    Feb 2001
    I  Voted
    I would, its cheaper than fixing an engine, although 2 degrees won't hurt anything either way. But if you did have detonation the knock sensor would retard the timing and defeat the whole purpose of advancing it in the first place.

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