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Old Jul 2, 2007 | 09:46 AM
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spark plug heat ranges
What is the next step colder from the 45's? Is it the 124's or are they two steps colder..and for that matter which ones are two steps colder?
 
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Old Jul 2, 2007 | 10:11 AM
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As original 1966 352 ~ BF-42; BRF-42. Colder: BF-32; BRF-32.

R = Resistor
 
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Old Jul 2, 2007 | 10:22 AM
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goes from 45's (hot) to 124's (2 steps colder then the 45's) and 113 (no longer make but 2 steps colder the the 124's)
 
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Old Jul 2, 2007 | 07:35 PM
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so there's no just one step colder?
 
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Old Jul 2, 2007 | 07:56 PM
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"NO".............. Sorry
 
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Old Jul 2, 2007 | 09:49 PM
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I thought there was a number 44 Autolite??
 
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Old Jul 2, 2007 | 09:54 PM
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I think maybe a 46 but I don't remember and I will have to dig in the books for that info.
 
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Old Jul 2, 2007 | 11:30 PM
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Don't bother Wes, I remembered that there was a 46.... but no 44. I was looking for that one step colder plug myself in the past!!!

BTW, what interchanges with the Motorcraft BRF-32 that NumberDummy mentioned??
 
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