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Old 01-23-2010, 01:31 PM
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Mac Mac is offline
Motorized Bicycle Elite Member
Join Date: Dec 2009
Location: Maine
Posts: 489
Default Re: Sparkplug Indexing??(Slant)

I know in the drag racing days we used to always index the plugs(BB Chevy) good for a bit more power. My last engine dyno, the operator did it too(Car engine) but that was a 12 1/2 : 1 compression, Heck I'll give it a try, I don't have any shims that fit these plugs, I'll pick some up when I get down to the speed shop. I'll post when I get results, even though it's only "seat of the pants".
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