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as far as running a wire to each head??? does it not have 17bolts doing just that??
(alum head iron block)

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I called MSD and asked about this. The response was that the coating on the bolts, or studs, along with the sealer, or moly lube used, can prevent a good ground!

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BINGO !!

Also there is no way that 16ft of spot welded metal is a s good as 16ft of copper wire.

my head grounds are bolted to the exhaust studs.