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Thought this was April fools till i realised it's a few weeks away.

Plug INITIATES the burn , that's all it does , too cold a plug for the application 'may' leave a 'tad' power on the table due to unburnt fuel residing in base of plug , then you have too hot a plug 'may' leave a 'tad' power on the table due to mixure being lit off 'slightly' earlier , pretty 'negligible' which ever way you look at it.




Ok... weather I believe or not, how do you explain
the difference in HP on the dyno and the better idle
quality if they are a straight change heat range wise
and I do understand the principles of the plug





This is the problem i'm having..............can't fathom how the autolite plug netted 5/10hp over the NGK , i would of thought the opposite , an autolite has a thicker ground strap than an NGK which could 'hinder' grounding..............bit like the multi electrode ground strap being the best thing since sliced bread , if this were the case 'indexing' a plug would also be hogwash.