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I won't be able to run any multi-strap plugs. If the strap isn't between 11:00 and 1:00 the piston will tap the ground strap and close the gap. Maybe indexing isn't the right term.

I have a 440 with a 12.5:1 CR. 452 heads. I'm running E85 for fuel. I have a digital 6 ignition. I have RJ12YC plugs in it now. Do I want to run a hotter plug? Is there a plug I can use that won't require indexing? Thanks