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Old 07-19-2009, 09:36 AM   #1
crazy'boutOlds
 
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Default Spark plug gap ?

Ok, here I go agian.
The motor is a 72 455. It used to have a points style dist. I put a HEI in place of it.

Autozone says the gap for the plugs is 0.040 for a 72 455. Is that with the points style dist?

My 76 service manual says a 76 455 should have a gap of 0.080! I used this as a reference because the 76 came equiped with a HEI.

I believe must, if not all of my SBO have a 0.060 gap.
Is this what I should run in the 455 as well, or go with the 0.080 refered to in the 76 service manual?

As usual, all and any help appreciated. TIA>
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Old 07-19-2009, 10:09 AM   #2
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Default Re: Spark plug gap ?

with an HEI i run .055 with my 455... some people may disagree on that gapping.. but my engine runs fine and since ive properly jetted my carb... It shows a nice even burn.. just my 2 cents

FYI ive heard many many ppl say running .080 gaps has a higher probablilty of frying the coil
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Old 07-19-2009, 10:13 AM   #3
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Default Re: Spark plug gap ?

Thanks Doug. I was thinking of splittin' the difference and going with 0.060.
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Old 07-19-2009, 11:55 AM   #4
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Default Re: Spark plug gap ?

i've always gone .060 in hei olds applications.
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Old 07-19-2009, 11:56 AM   #5
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Default Re: Spark plug gap ?

Quote:
Originally Posted by crazy'boutOlds View Post
Thanks Doug. I was thinking of splittin' the difference and going with 0.060.
Thats what I'd go with. I remember when GM brought out HEI back in the early 70's it was a surprise to have different plugs and a .060" gap! Alot of people questioned a .060" gap, but that was correct.
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Old 07-19-2009, 02:03 PM   #6
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Default Re: Spark plug gap ?

All of my HEI applications that I rememebr were listed as .080 gap. 75 cutlass 260, 76 cutlass 350, 1980 cutlass 260.
I never had an issue with burning up a coil with the stock gap, but now that I am older and wiser I'd stick with .045-.050 gap. The large gap just is not needed.
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Old 07-19-2009, 02:34 PM   #7
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Default Re: Spark plug gap ?

i would stick with 45
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Old 07-19-2009, 08:19 PM   #8
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Default Re: Spark plug gap ?

I like .045....easier on the ignition components....
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