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Old 09-15-2008, 01:33 PM
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MSD Ultimate HEI Upgrade Kits

I'm considering one of the MSD Ultimate HEI Upgrade kits for my GM HEI ignition. Does anyone have any experience with these? Is this just a parts swap or does it necessitate readjusting the timing, etc?

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Old 09-15-2008, 07:07 PM
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If you're talking about P/N 8501, it is just a parts swap. I ran one for a few years on a mild SBC with no complaints. Picked it up after having some high rpm misfires related to a few (poor quality) ignition modules.
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Old 09-16-2008, 06:09 AM
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The MSD HEI module is a little tougher to get in and out of the ditributor body, I found it necessary to remove the distributor from the engine to mount it properly. In that respect you will have to re-set the timing when you re-install it. I wouldn't expect it to change anything else though.

I went with the matching MSD coil and was impressed with the increased spark output - especially at higher RPM.
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