I don't think the BBC fits down inside the frame rails of the M. I can't remember ever seeing BBC in an M. Neighbor had a 396 powered F-20 for a chore tractor, EX-pulling tractor from the 1960's, had a great road gear but struggled to run his mix-mill, pto rpm too low. Seen a lot of SBC in M's. Was a really sharp pulling M around northern Illinois in the late 1960's, early 1970's. Had a FORD GAA V-8 engine. 1100 cid. But it was based off a 1650 cid V-12 airplane engine, 60 degree cylinder bank angle, with some work it fit between the frame rails. There was a GMC 637 cid V-8 engine based off the 478 cid V-6, 60 degree V between banks, use used in heavy medium duty and heavy-duty trucks after the 702 cid V-12 went out of production. The 637 was the LARGEST displacement V-8 engine General Motors ever made.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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