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It's colder. The ar3933 would be an equivalent heat range. However, the ar3932 and ar3933 are a different style plug (3/4" reach, gasket seat) than an mr43t (.460 reach, taper seat) Just stating, you may already know that. Ar133 would be an equivalent heat range in the same style plug.
 

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thanks for info .kaama said the same thing. i was worry that the plugs were to hot . i got new motor i am trying to dail in 540 dart 600 ponys
 

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