![]() ![]() Warm Idle for manual trans should be 650, 750 for automatic Then disconnect vacuum advance, PLUG THE HOSE, and set base timing So get it started and let it idle for 10minutes. Its best to set timing after engine is warmed up The manifold Vacuum is "in effect" throttle position, but not as accurate as a TPS(throttle position sensor)ĭuraspark distributors are the popular choice for HEI conversion as they used similar hall effect sensor in the distributor and are vacuum advance.Įither setup/distributor would have centrifugal advance(weights and springs) in the distributor for RPM Spark advance.īase spark timing is set without computer or vacuum advance connectedġ0-12deg is suggested base spark time for these engines. ![]() ![]() HEI was used with Vacuum Advance distributors. If you had a TFI ignition system it needed spark advance info from the Computer, the SPOUT wire, because computer has throttle position data. ![]()
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