Re: Question for the guys running aluminum heads
If it were mine I'd lathe cut some .150" spacers from copper or brass and use NGK B6ES -B8ES depending on desired heat range. In NGK, lower numbers are hotter.
Terry
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"It don't take but country smarts to solve the problem" (Smokey Yunick)
'41 Merc Town Sedan / 260" 8CM engine
'66 Fairlane four door / "warmed up"  302
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