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Old 11-19-2012, 09:48 PM
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I cannot remember if those specific 492 casting heads use a .460' reach tapered seat plug
or the older style plug with a 3/8" reach.

but when you figure that out gap the plugs at .035"

In as NGK you would use a 6 or 7 heat range.

in a champion you would use a 9 -10 or 12 heat range.
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