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Thanks, these are all numbers on the drivers side of the engine. Are there any on the pass side I should look for? Also what cubic inch is this one? It actually runs quiet well.
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The engine numbers are only listed on the left (driver) side of the motor. The T 308 is a 216 Cu In with 97 HP.

The Power Wagon T 137 is 230 cu in and was rated at 103 HP.

In the last 67 years, any number of changes could have taken place on that 51/52 truck. The old flathead could have been bored and had a milled head added that would change the HP numbers and cu in in a hurry. If it runs good, and you can live with the power level, use it.

I don't pretend to be any kind of authority, but I've got a book that has proven to be pretty accurate. Its just too bad some of the info I would like to have is not in the book. I have owned a few trucks from the 50s era, though restoring anything is not of interest to me much. I like the old body styles, but give me the modern drive train, suspension, and brakes any day. Gene