Re: 1964 GMC "crustine" semi-build.
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If you want to go to .060 gap, that's something I just did recently on the plugs then get some HEI spec plugs. I found AC R44XLS6 PLUGS have the correct 3/4 reach and are within the heat range. These plugs are actually for a 90's GM 4 cylinder application
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Cool! I'll look into a set! I have NGK's in it right now. Was gonna gap then at .045 or .050 and see how the engine responds. Have to clean out the spark plug galleys again cause they have pine needles! lol
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
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