432 Spark Plugs
I should be going to pick up a 1964 GMC 4000 here in the not too distant future and I was wondering what spark plug I should get for it. It originally had a 305 in it but that has been replaced with a 432 as I have been told. Also I have read that a 432 is a Magnum motor with out the designation. Is this true? How do I tell if it is or isn't a "Magnum"
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