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I ground my neg. to the frame and run a ground from each aluminum head to the side of the aluminum block then to the frame again per MSD inst..

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This is the only way you want to do aluminum headed engine with a nasty ignition....Each head must be grounded....Otherwise the coil wire will arc to the head or anything close to it.

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I am sure that there is a good explanation for this, but... why is this necessary with the contact of every head bolt joining the heads to the block ?