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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: Mar 2014 Posts: 4,501 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,501 | Does your HEI ignition scheme include anything made by Pertronix? It looks like you have a stock distributor and vac advance. 12 to 15 BTC at idle with no vacuum sounds high as a starting point. I'd drop that to between 7 and 10 BTC. I have HEI (Tom Langdon's unit) and something around 8 has worked for me. Electricity invariably follows the path of least resistance. If you're too far advanced spark may leap to the distributor post adjacent to the one it is supposed to hit and that will cause problems.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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