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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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#2
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Re: 432 Spark Plugs
Its listed on the Jolly data page as magnum and I think they are a rare breed too.
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1961 GMC Suburban 305A Overdrive 1962 GMC Utility 305D |
#3
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Re: 432 Spark Plugs
The 432 is a magnum engine that was introduced in 1973, basically a 401 with the 478's longer stroke. The spark plugs are a short reach tapered plug, If I'm not mistaken it's an AC R43T which is an old number so it needs to be crosslinked to a current number, this was a common lug used back then and shared with other GM engines
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#4
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Re: 432 Spark Plugs
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Re: 432 Spark Plugs
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#6
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Re: 432 Spark Plugs
The spark plug that supersedes the R43T plug is an AC Delco 10 plug. It is important you use this particular style plug because it has a tapered seat and very short reach that was only common with the larger 379,432 and 478 V6 engines built from 1973-74.
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