mcr:
The engine in the 250S, a version of the M180, is also known as a M108 or M129. In 1968 it was re-labeled the M114 and used in the /8 chassis. It is the engine of the W114, hence it is a "bolt-in" in the W115. It is a bolt-in if you find the correct engine mount arms. The crank will accept a pilot bearing, and if your flywheel has the same crankshaft bolt pattern, it can be used. Because the engine is longer, the drive line will be shorter, as will the shift rods.
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