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Hi,
I have 454 running in the rod with headers, I have run higher grade plugs which means more heat, but at this stage no damage can be seen on the leads. My mate is also running 454 in his rod with again higher grader plugs and no issues. I dont think your problem is headers if anything they would release the heat.
Let us know I would check the battery output along with the charge from the dissy.
Regards
Peter |