The GMC six cylinders in the 50's were the 228, 248, 270 and 302. The were all overhead valve engines with full pressure lubrication were the chevy 216 and 235 sixes were still splash fed on the rod bearings. The GMC sixes were extremely tough engines and would out do most of the standard truck engines offered at the time in power, and durability. Many REO, Diamond T and other makes were often retrofitted with "Jimmy" sixes and the 302 version was often used in hotrods in the 50's due to its large displacement and power. One actually set a land speed record at over 200 mph on nitromethane. There are still performance parts offered for "Jimmy" sixes.
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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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