Spark plug gap

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03-24-2007, 10:02 AM

gripit

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Spark plug gap

What would be the correct gap on a 454 with dart iron eagle heads and holley 750? I'm using AC delco plugs. Thanks

Last edited by gripit; 03-24-2007 at 10:05 AM.

03-24-2007, 11:09 AM

Hydrocruiser

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My best guess is .035

03-24-2007, 12:23 PM

Pwrbt33

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If you dont have MSD or like ignition leave it at .035.

Set your timing around 30 to 32 degree's.

John S.

As far as anti-sieze, just a touch of it on the threads will do. What ever you do, do not use grease.

03-25-2007, 05:24 AM

cig1988

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What plug # are you using ?

03-25-2007, 05:50 AM

Craney

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Quote:

Originally Posted by Pwrbt33

If you dont have MSD or like ignition leave it at .035.

Set your timing around 30 to 32 degree's.

John S.

As far as anti-sieze, just a touch of it on the threads will do. What ever you do, do not use grease.

What should your gap be when using MSD?

03-25-2007, 08:40 AM

Pwrbt33

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With an MSD or Crane box you can get away with .038 to .040 on the gap. The plugs seem to last a little bit longer with the larger gap. At .035 they seem to burn up faster.

John S.

03-25-2007, 09:52 AM

KAAMA

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In reference to a Crane ignition box---don't quote me, but I think it says in their manual they recommend a .045" gap on a spark plug using their Hi-6M ignition box with their PS-92 coil. Whether a .045" gap is truly a good place to gap it at I really don't know.

03-25-2007, 09:58 AM

cuda

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With a high output coil, you should be able to run a .45 gap.

03-25-2007, 10:35 AM

Pwrbt33

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I've run our 1200 Cobras at .045 when we got them back from Randy and the plugs would foul and wear out quick. I tightened the gap up to .040 and got double the amount of hours out of them. Just my personal experience. A lot of other people will tell you the same as you also.

John S.