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Hello "FrankUSMC" I was Shanhai'd into the Army in 1964 where I then became aware of the M37s and drove and rode in them. Most of the remaining M37s do have the ancient archaic or good old flat heads. I have only seen Cummins in the M37 by viewing on the internet. I have helped install 2 small...

Hello "Juskatla", The M37 engine of 230 or CDN 250 are almost identical for performance. Here in the USA the absolute so call Holy Grail for engine replacement for the M37 is the Chevy Small Block since 1955. There are and have been hundreds, if not a few thousand, Chevy Small Bolcks (others...

Hello Bert (T. Highway), I would like to clarify "Rotating Balancing and Compression Ratio". Compression Ratio and Balancing the rotating assembly are absolutely NOT related what so ever. By the way, if our bureaucratic government would have upgraded the complete drive train (around early 1960)...

Hello "nattieleather", I agree, "doing a lot of work" on the M37 flat head engine is putting "lipstick on a pig". Milling the head for higher compression is about the easiest work to do and for not much $$$. As soon as my other 3 projects are completed, I am taking a M37 and removing the...

Hello "teletech", Thanks for your input. However, a 3 angle or multi-angle valve and light porting improves horse power just a little bit as compared to increasing the compression ratio. I (M.E. Degree) can supply engineering thermodynamic formulas (Otto Cycle) to prove my point. You can mill...

Since the M37 engine (78 HP Dodge T245) has a low compression of 7:1, an easy way to increase Horse Power is to increase the compression ratio to 9:1 which should result in adding 15 Horse Power. Removing and milling the head to 9:1 compression ratio is somewhat simple. However, you need to...