I have a 1966 M670 Super Diesel that will need to be overhauled. I just picked up a M&W turbocharger set up for on this tractor. From reading though the archives, it doesn't sound like the turbo will wake them up much. This tractor is more or less a toy to mess around with. I think it would be really fun to have a 670 in the 120 horse range. I won't be plowing with it weeks on end or taking it to a tractor pull every weekend; however, I would like it to be a reliable motor that will hold together a couple thousand hours. That being said, would the 336 diesel crank hold up to being offset ground to a 283 rod to bring the stroke up a little? Or would this just be a recipe for a rod taking flight? I have lots of parts, including a 403 crank, but with the 403 crank and short blocks I would have to use 4.81 pistons which I'm guessing won't take the abuse. I suppose I could use a 403 crank, rods, and 403 blocks but then everything gets very tall under the hood. I am just brainstorming out loud. I'm sure some of you guys have a lot more knowledge over this than I do. Like I said, it is a toy but might cut hay and go plow for an afternoon and end up on a swing hopper so reliability is a big factor.