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Flathead six


Kip41

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I recently purchased a 1941 pt-125 Plymouth truck and I am trying to find out what motor is in it. It is a flat head six I'm guessing the block is about 23" and the number on the block is 4374 UTAH can anyone help thanks

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sounds like it's probably from a state that titled on the engine number rather than serial #. Often those states would stamp their own numbers in the case of engine replacement and then assign a matching title to the #

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Is it 23 1/2 inches long or 25?  In the head over #6 cylinder is a threaded pipe plug, removing it will allow you to insert a piece of stiff wire.  Remove the spark plugs and manually rotate the engine.  Measure the movement as the wire follows the piston. Make sure your wire is about seven inches long.  In a 23.5 engine 4 3/8 is a 218,      4 5/8 is a 230. Assuming of course it is a post 1941 production.  Chrysler sold unnumbered blocks to rebuilders,so to echo the thought above this was a replacement unit assigned a number by the State of Utah.  Sometimes you can find a duplicate original engine number on the frame behind the driver side rear wheel.  Some serious effort with a wire brush is necessary to reveal it.

N

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