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Old 03-27-2007, 08:39 PM
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Pontiac 389 with HEI

I'm in the process of building up a '65 Pontiac 389 engine and plan on using a Summit HEI distributor. The plugs that were in the engine when I got it were AC R45S. According to my Chilton Manual, they went to HEI in '75 and used R46TSX or R45TSX plugs gapped at .060. Is this what I want to use taking today's gas into consideration and the fact that I plan on staying at the stock compression ratio of 10.5 to 1. Any info would be appreciated.

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Old 03-28-2007, 12:25 AM
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kreuzn1 ...I LOVE Pontiac 389's!!! My first engine I rebuilt MANY moons ago (never mind how many!)!! ...Ok, when you change a regular distributor out in favor of a HEI you need to do two things. One - remove the resistor wire that protects the old points system. This knocks the voltage down to the points when the engine is running to protect the points from burning. IT normally knocks it down to about 9 volts. ...You'll need all 12V to operate the HEI correctly (it wil run on the 9Vs but the HEI system is looking for 12Vs). Second - is the spark plugs. Use the original plugs called for on that engine ...BUT you need to change the gap from the original 0.035" to 0.045" ...then watch the color of the plugs so they don't run too hot. This can lead to major problems if not caught. Good Luck!

PS ...When you have problems with the rocker arms studs pulling, drop me a line! *G* ...Mark(11echo)
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Old 03-29-2007, 07:27 AM
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Thanks for the info. I asked the guy who runs the local engine rebuild shop the same question and he told me the identical thing. kreuzn1.
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