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Some other differences but unsure whether just production changes or formally part of the B1 variant: Later models have a more rounded two part air cleaner; the older version has a 3 part system using 3 clamps with wing nuts to hold down the cover rather than a single nut in the center of the...

Good mnemonic device. Thank you. My B1 mystery deepens in that my truck has (had) the Douglas connectors. I'm replacing with a new harness with Douglas. So, it seems that at least some early B1s were hybrids until early parts inventory was exhausted. Does anyone have information on that front?

Thanks for the correction, Rory. Yes: Metal shell wire connectors are Douglas. Rubber are Packards. Things are confusing enough sometimes in this hobby without some careless post like mine making things worse. :censored:

We might be getting in the weeds a bit with this one. I haven't been able to find a definitive comprehensive list of differences between the base original M37 and the B1 variant, so I thought I'd "crowdsource" the information. I have found that Dodge shifted to B1 production in April, 1958. My...