spark plugs
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From: Mapleview,Mn.
spark plugs
The 351c calls for a sp450 Motorcraft plug,what would the Motorcraft number be for a one step hotter plug.I have spent at least 2 day trying to find a heat range chart for Motorcraft and nothing:
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Joined: Apr 2004
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Check post #15 here. He found an AC plug that works and claims it's one or two hotter than the stocker.
Spark Plugs - all pretty much the same? - Vintage Mustang Forums
I can't find any decent Motorcraft heat range chart or cross reference either. Not the exact answer, but an answer.
Spark Plugs - all pretty much the same? - Vintage Mustang Forums
I can't find any decent Motorcraft heat range chart or cross reference either. Not the exact answer, but an answer.
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