Ok... here I am thinkin to much again. So my '60 D6B (44A) has what I understand to be the D333(a) engine which is the non-turbo version. Currently it runs great and I haven't really had any issues in pushing trees over and stacking up brush thus far. I understand however that the D333(b) version is the turbo version of the engine and I can't help but consider the potential advantages of attempting (some time down the road) a turbo retrofit to improve fuel efficiency and provide a bit of power increase to the 'ol girl. My question to everyone is... am I off my rocker? And if not.... what are the criticals I need to consider in such an adventure?

don't think you're crazy for thinking what if you had a turbo and few extra ponies without hurting fuel economy etc..

-but my guess is the gain is minimal for the time and expense involved, especially if machine runs fine and does what you're asking of it..and how much use it gets etc..
-"IF" you can do the work yourself and can acquire the turbo and necessary plumbing and manifold bits $reasonably$...maybe !
-don't mean to be "Debbie Downer" but trying to be realistic with expectations

some of the turbo engines had piston cooling via oil spray the non turbo engines often didnt have this feature and wont handle it well due to the higher combustion temps and son and will wear out quicker. or over heat piston and other nastiness.

personally dont open a can of worms.

I've got to add "seiscat" to the list of naysayers to the turbo idea. While the parts book for your tractor does show a turbocharger for "high altitude normalization" starting on pg. 246 I think the parts would be very hard to find and too expensive. 
Then again, if your resources & finances are unlimited, go for it!
Craig 

Hey all,

I have gotten enough feedback that I have to concur that it's probably not a good idea. It was a romantic fantasy for a moment. Truth be told, I absolutely love what I have. Used it this afternoon to unstick my 3500HD dually flatbed from the grips of soil turned to snot from the snow melt today. The D6B fired right up and made it child's play. Thus far the dozer has done everything I have asked of it and then some. The right steering is working so flawlessly I can't wait to spend a bit of time to try to tune the left in to be the same. At that point I think all I will need to do is enclose the cab area. Get's a bit nipply when the wind is creating a negative chill factor and need better protection when pushing brush piles.

Thanks all for the feedback.

much better to direct your time and energy to where you get a better return...improving the cab area with some heavy screens is an excellent idea to improve safety all round, esp when pushing brush etc...
-diving into the engine and turbo at this point is too much like trying to fix something that ain't broke