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1963 102 spark plug gap confusion
Posted by: Peeeot ()
Date: April 14, 2019 06:48AM

Hello,

I searched “plug gap” and browsed all 11 pages before posting. It seems most folks recommend 0.030” plug gap for the higher-performance naturally aspirated engines with stock ignition and 0.035” for the low-performance engines. There is a non-GM chart that supports these gaps. However, in the specifications section of the 62-63 manual, it identifies the gap for all engines as 0.025-0.028”, but then in the tune-up section of the 62-63 manual it specifies 0.035” for all engines. The 62-63 electrical section refers back to the 61 manual, which specifies 0.035” for all engines.

So, there is an unofficial recommendation of 0.030” and conflicting official recommendations of 0.025-0.028” or 0.035”.

Which is correct?

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Re: 1963 102 spark plug gap confusion
Posted by: junkman ()
Date: April 14, 2019 08:06AM

Are you certain that you are not confusing the distributor dwell specification with the spark plug gap specification?

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Edited 1 time(s). Last edit at 04/14/2019 08:07AM by junkman.

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Re: 1963 102 spark plug gap confusion
Posted by: MattNall ()
Date: April 14, 2019 08:09AM

The one that works for you!

Just like our Head Torques... 50 years later.... recommendations have changed!


I'd go with 0.030" and see how long the plugs last.... most likely years and 20k miles..

No lead in Gasolene today...





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Re: 1963 102 spark plug gap confusion
Posted by: Peeeot ()
Date: April 16, 2019 06:02AM

Yes, I am certain I am looking at a plug gap spec and not dwell angle in the manual.

I will go with the prevailing wisdom and set them at 0.030”. Thank you!

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