Sir, where a distributor is stabbed in at TDC of the exhaust stroke TDC instead of the compression stroke TDC... the universe presented exactly that to me with a fellow's vehicle on Friday while on a "house call" to verify/set float levels and dial in a 750 Holley's idle speed and mixture that I had built for his truck... before any dialing in could take place though, the cranking, no start, and earth-shaking gunshot backfires out the exhaust needed to be addressed, LOL! Firing order and distributor rotor position and crank/damper position appeared correct... removed the valve cover to see what #1's rockers/valves were doing at that point... exhaust just closing, intake just opening... wrong TDC... hence the spectacular gunshot backfires. Pulled distributor, rotated crank 360-degrees, reinstalled distributor, va-voom
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