Thread: Spark plugs
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Old 04-08-2017, 10:31 PM
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Bill Hanlon Bill Hanlon is offline
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Join Date: Feb 2005
Location: Fredericksburg, TX
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My '57 GMC (Pontiac) V8 with a '77 HEI was happy with AC 45 plugs gapped at 0.050"

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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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