Changing 4cyl only 7al to work on 8cyl?
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Changing 4cyl only 7al to work on 8cyl?

  1. #1
    Senior Member Lildave's Avatar
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    Default Changing 4cyl only 7al to work on 8cyl?

    I didn't know where to put this, but I have a 7al2 part # 7224. It's a 4cyl only box. MSD says they can change it to work on an 8cyl for $35 plus whatever it costs to ship it, but if it's something really simple that will cost me $0.25 at Radio Shack, then I'd rather do that. It'd be quicker and cheaper both.


    Does anybody know what MSD would change inside of a 7al2 made for 4cyl to make it work on an 8cyl??

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    Hoodys and swim trunks Elkidminoltu's Avatar
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    This may not be the answer you're looking for, but I didn't think there was a difference between the two besides clipping a wire under that little round black cap for a 4cyl. I think it's only for the rev limiter though.

    So in theory, if you re-solder that clipped wire, it should work for the 8cyl.

    For $35, it's better to have it done by MSD. Better safe (with a running motor) than sorry (stranded on the lake).

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    Senior Member Lildave's Avatar
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    I agree, if it's something very involved at all then for $35 why not send it off. I was just thinking if it was something stupid simple then I'd just do it myself. I guess I'll call MSD and send it to em. Mainly I was wanting to fire the boat up this weekend, and they say 5-10 business days return time.

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  6. #4
    Hoodys and swim trunks Elkidminoltu's Avatar
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    Not sure what your mods are or motor? But if Chevy, toss a HEI in there, hook up a power wire and fire it. It'll do the job for the time being.

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