Which makes and models are easiest for engine swaps?

Which vintage pre-1960 tractor makes (and models) are the most user friendly for making engine swaps to completely and entirely different engines? For example a small-block Chevy 350 V8 or a Toyota 4 cylinder engine. Some look like they would be impossible to swap engines in (the models where the engine and transmission ARE the tractors frame for example would be impossible).

Some look like they would be fairly easy to swap, but it's kind of hard to tell because I've only seen pictures. Some look like they have a full frame in them like certain Allis-Chalmers', Massey-Harris' and Oliver's.

But again, I can't tell for sure because I haven't seen them up close and studied the way they are assembled.
 
The most interesting engine swaps that I have owned were a L Case with a 3/71 Detroit and a 1952 LA Case with a 4/71 Detroit. My son had a 4 cylinder Cummins with the mounts that came out of a L Case Chassis with a electric starter. About 40 years ago I helped my neighbor put a Big Buick with automatic transmission in a IHC F30 Chassis, this thing is still around and still is used some.
 
Massey and Oliver have tub frames and quite easy to replace the engine in and you just need a drive shaft to get power to the trans or you can add another trans. in front of the oem. we had a 44 Massey with a 248 perkins diesel in it and it was a real good tractor kind of neet how you can make things work and look good for a little cash
 
I have a Allis Chalmers B with with a Toyota 20r engine and trans mated to the tractor trans. For Sale in Indiana. I has a woods 60" belly mower and a 3 point hitch. It all works really nice and has tons of gears......
 
We built new 14" longer frame rails used the allis front axle, the allis rear end and transmission and built a very short driveshaft and machined 1 end to fit the rear splined shaft(tractor) and the other end slides into the (toyota)transmission. If I could figure out how to post a picture I would post one......
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its not at all impossible to swap just cause the engine acts as the frame, ya just gota build a subframe adapter of some sort, to fit around the motor and mount up to the bellhousing. i put a ford pickup engine ,300 six cyl,into a cat road grader a few years back, it used the engine not as the frame of the machine but had no traditional motor mounts as an auto or truck would and the radiator and everything else on back mounted right to the motor, so i took half inch plate and cut out the shape of the bellhousing and then added 2 rails of 4 inch channel to that, and the motor sat inside it and the radiator and accesories all had a place to attach off of it. worked very well and alot easier to get engine parts for than a 1936 vintage cat motor
 
I recall many moons ago, before high hp tractors were available, there was an article in a farm magazine about a large operation repowering a number of LA Case tractors with higher hp engines. (I don"t recall what) The gist of the article was that the LA was an easy conversion and the rest of the drive train was beefy enough. That"s all I recall about it.
 
We owned a MM GTB w/ a 371 in it for yrs . It was one of our "regular" farm tractors .It would stay w/ the 4010 diesel. It came up from So. Ill. to northern Il. in the mid 60 s. Last I knew, it was in So. ind.
I have been around another M M w/ a 471 in it about the same time.
Ahh, The Great horse power race in the corn belt in the 60 s!!
 

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