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You should have a vented fuel cap on the M-37 like the one inthe pic, make sure the ( fording ) valve in the cap is open ( see pencil ). The little 1/8"vent line that runs from the tank to the airhorn is for when your fording and really doesn't vent enough when your out running high rpms.

Jim Alans article was on his long gone website "MV Central" this was going back almost 12 years

If your getting 6ohms means the resister is letting to much voltage to the coil/windings, this has been a ongoing problem with imported coils, if this was me I would ad a external resister to the dist power lead this will give lower voltage to the coil to which it will run cooler. This symtom...

Tom Think about it Do you really think that big metal dist thats attached to a hot block and also has hot air blowing on it from the radiator fan is gonna be kept cool by 2, 3 ft long 1/8" od" lines

YES OF I stated how to check the ohms in a internal resister coil in my previous post. In 14yrs I've only seen one of these with that original setup, I have a e-mail in to a buddy to see if he has a picture of this setup Also you guys, they are VENT lines NOT cooling lines that run from the...

OF There is a ballast system and ( as I mentioned ) its internal, early M-series ( 1951-2 ) had a external ballast resister which was stacked under the coil ( early non resister coils were shorter and sat ontop of the wafer type resister in the distributor ) these were superceded by the taller...

Miltary coils have internal resisters The ohm resistence on your coil should be between 10-14ohms anything lower will cause shorter coil life ( coil runs hotter ), if you do have low resistence then you can ad a external resister to bring it up ( to check resistance put ohm tester leads across...