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Old 03-25-2007, 04:13 PM
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external coil for hei info needed

i have a 78 model gm hei wanting swap over to an external coil . installed msd 6a and having high rpm flutter problem . would any old accel super coil work for this. need to know what kind of cap fits hei that allows for external coil .
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Old 03-25-2007, 11:52 PM
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The fact that the HEI coil is in the cap is not likely your problem. I'd be looking at spark scatter caused by rotor/cap phasing misalignment, distributor bearings and a burned center post under the coil in the cap. Replace the stock GM high resistance carbon center post with a MSD solid copper/steel post.
May have to replace the damaged (burned) cap and rotor too. The stock GM carbon center post over heats and burns the cap and rotor up when using a MSD6A ignition.
Make sure your ignition wires are not paired together on adjacent cylinders especially 5 and 7 and 1 and 2.
The wires should not run parrelel together or crossfireing induction can result. Get some good heli coil wound spark plug wires. Do not run solid core wires.

If you insist on converting to a extrenal coil use the MSD HEI external coil conversion kit that includes a new MSD Blaster 2 coil and a special HEI distributor cap with a coil wire terminal on top. You'll still need a new steel center post to replace the stock GM carbon post that over heats.
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