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  1. #1
    Registered SledgeHammer's Avatar
    My Boats:
    2001 Baja Hammer
    Join Date
    Jan 2002
    Davenport, IA

    What should spark plugs be gapped at?

    I have a 468 with Merlin iron heads, 731 Crane Cam, 9.3 to 1 compression 750 Holley, MSD ignition and Eddie Marine Exhausts. The builder put MR43T AC plugs in it and set the timing at 35 degrees. I need to replace the plugs and I am not sure what they are supposed to be gapped at. Any advice?

  2. #2
    Registered Crazyhorse's Avatar
    My Boats:
    38 Cigarette flat-deck
    Join Date
    Jan 2001
    Holland MI

    Re: What should spark plugs be gapped at?

    I gap mine at .035 but you'll probably get varying opinions on this subject.

  3. #3
    Platinum Member Platinum Member articfriends's Avatar
    My Boats:
    EX 99 MPH 272 Baja owner, 1999 Scarab 33 AVS NOW
    Join Date
    Jun 2004

    Re: What should spark plugs be gapped at?

    .035 but with the msd and no blower you might see a slight power gain by opening them up .010 at a time,Smitty

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