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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I retimed using vacuum gauge timing technique (maximum vacuum at idle).
From Pertronix:
What should I gap the spark plugs to?
The Ignitor has no set specification in which the spark plugs should be gapped at. Every engine responds differently to spark plug setting. In most cases increasing the factory recommended gap by .005 improves the engine performance.
.033-.038 (0.035) was original 1953 235 gap-spec (AC 44-5 Commercial plug) | | |
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