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  • Spark Plugs

    In all the reading I have done, I never found a replacement for the stock IH spark plug after a throttle body fuel injection conversion?

    While visiting a friend at the parts store today we tried to find basically the same plug as the IH but a bigger gap. Instead of opening up the gap ending up with a slope instead of a gap.

    In the Autolite book we found a 75 which is close but the electrode was extended (into the cylinder) approx .060 and had a gap of .040 to .045.

    He will spend some more time in the books and other brands for me but wondered if anybody has gone through this yet?
    [CENTER]1994 Buick RoadMaSSter Estate Wagon LT1/4L60E. White and Woodgrain Sleeper...PCM 16188051 With SS/V4P/Custom Tune! WOT 12.9 AFR!

    1990 Chevy Suburban Silverado 5.7L 2wd ECM 1227747 HiWay Lean Cruise 18.5 MPG and 12.5 to 1 AFR at WOT!

    1972 IH 1210 Isky Cammed Balenced 345 4 speed PCM 16197427 Project!

    [SIZE=3][B][URL="http://www.gearhead-efi.com/"]GearHead-EFI.com[/URL] EFI Conversions and Chip Tuners![/B][/SIZE]
    [B]May be all you need to know about EFI![/B]

    and I still help local JustIH members (for fun) free! :cool: [/CENTER]

  • #2
    I've been so wrapped up in the chips I have never even thought to change the plugs yet.
    I have pulled them a couple times to look at them(they looked clean) but never thought about changing them yet.
    Given the compression ration and combustion chamber, I don't really think an extended electrode would be bad. It allows the spark to be unshielded. I doubt there would be an interference issue with the piston.
    Bill USN-1

    COMMITED TO TEACHING PEOPLE THE "PROPER" WAY TO EFI
    HAMILTON FUEL INJECTION
    May be the answer to all your fuel injection needs!
    Learn to do it right.

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