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Since this thread came back to life I might as well add some current info. I threw a rod on my 396 Big Block in the M715 in March 2012. It happened on start up with a hydrolocked cylinder. Not doing some crazy hi rpm mud run. Anyway, I put a HMMWV pull out 6.2 in last winter and have been...

You mean the one in the picture below? I remember looking at it because Colton tried to stand up and wacked his head on the frame. He had a knot on his head for days after that. I was so impressed with how easy that was. That I came home and built a pto cover out of 1/4" steel. I saw it...

BOB, All the stuff you mentioned has to be done no matter what engine is swapped in. That stuff is the "given" for a motor swap. I last saw Lee's 4Bt truck in your shop back in 2006. So we both know that a 4BT is a simple engine to fit into a M715. Sure it has to be plumbed and wired, but so...

PM or Email Mcinfantry. He build a M715 exactly as you described about 8 years ago. He has since sold it, done the same to a few other vehicles and is redoing one now. Mounting a 4Bt is easy. So is a 6Bt actually. The 6Bt just has a little too much length for the M715. 4Bt is not a...

As written above. If you can get a SBC or BBC in there, a 6.2/6.5 will fit and bolt up the same way. As also mentioned above. Gearing is going to be a problem. I have a NV4500 in my M715 with the Michelin 11.00-16 tires. 5th gear 2000 rpm is 52 mph. Which just happens to be as fast as I...