The Stovebolt Site Forums The Shop Area Engine Shop 1951 GMC 350 2 ton engine swap

Hello all,
I recently purchased a 1951 GMC 350 2 ton and the piston connecting rod broke. I also suspect a small crack in the engine block. I am looking at rebuilding replacing and possibly even swapping for a newer engine. Does anyone have specs or ideas for a new engine for this truck.

If you would like to keep your truck a 6 cylinder, there are many available that are direct bolt in replacements for your engine. I assume your motor is a 228 6 cylinder. There is a flat pad on the engine where the distributor goes into the block. There should be a motor serial number stamped on the pad. The first 3 numbers of the motor serial number are the engine displacement. There also might be an issue with 6 volts vs 12 volts.

If your truck has the GMC 6 you could use any 1939-1953 228, 1939-1956 248, 1941-1959 270, or 1951-1959 302. 1954 and later engines might pose some problems due to a different front motor mount setup. Additionally some gmc motors have 4 lug flywheels while others have 6 lug flywheels. The flywheels from bigger trucks are different than the flywheels from the 1/2 ton through 1 ton trucks.

Thanks for the info. The truck has a 248 in it. I am looking around now for a replacement. I will probably go bigger if presented with a choice. Have a nice day.
-Yori

yori....check the adds at OLD GMC Trucks and Inliners.org.
I see Jimmys for sale in there quite often.

Thank you very much. I'll check it out.