MD using a FE block and crank with FT intake, heads and exhaust
A Autolite carb was used with a velocity governor made into the 2 inch tall carb spacer, it also used a standard FE distributor
HD version used all FT components with a Holley 2 bbl carb equipped with a governor that was controlled by the special FT distributor
361 was available with Holley 2 bbl or 4 bbl carb with distributor controlled governor
391 came with 4 bbl Holley only
A California emission version was available with 2 bbl Holley labeled as a 389
The factory air cleaner had a snout that lined up with the scoop on the right side of the hood. A flapper in the snout allowed warm under the hood air into the air cleaner for quicker warm ups and cold weather driving, once under hood temperatures reached the proper levels the flapper moved to allow cooler outside air into the engine for better performance
Normally a F-750 would have a 361 but the 391 was a option
With over 1/4 inch difference in stroke length pulling a spark plug and checking stroke length should give a pretty close guess as to the engines size
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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