472 spark plug question
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500, 472, 425, 368 Discussion, 472 spark plug question in Cadillac Engine Technical Discussion; I am converting a 1969 472 to HEI do I need to change the gap on the plugs they are ...
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    cadillacdeville's Avatar
    cadillacdeville is offline Cadillac Owners Fanatic
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    472 spark plug question

    I am converting a 1969 472 to HEI do I need to change the gap on the plugs they are new bosch plugs set a .035 gap which is factory but thats with points type distributor the 425 its replacing is HEI with plugs set at.060 any info is much appreciated

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    caddydaddy's Avatar
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    Re: 472 spark plug question

    The HEI is a much higher power ignition system, which provides a better spark. So to take full advantage of that, run the 0.060. I use the same set up on my 1972 472.

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    Re: 472 spark plug question

    thats what I'll do. thank you for the info.

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    Night Wolf's Avatar
    Night Wolf is offline Cadillac Owners 10000+ Posts
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    Re: 472 spark plug question

    yup, I'll second the .060"

  6. #5
    Fleet's Avatar
    Fleet is offline Cadillac Owners Enthusiast
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    Re: 472 spark plug question

    Speaking of spark plugs, I would like to go colder plugs on my '69 Fleetwood Brougham. Just one step down (colder). What would the part number or code be for that? The orginal part number for the plugs recommended is R-44-N, but I doubt that code is still used at auto part stores.

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