192 head on 172 block

I indirectly asked this in another thread, but would like to ask again, more specifically.

I have a 1964 4000 utility tractor used for normal duty, and I have a spare 192 industrial engine that was in a tow behind trash pump.

Both engines have a slight knock, and I'm not sure where it is coming from on either one. Aside from the knock they both run well. The 172 has a cracked head that was welded about 20 years ago. I believe it overheated when mowing and the radiator got clogged with dandelion seeds.

The main question is, for my '64 4000, can I put a 192 head on the 172 block when I refresh the motor?

Assuming the 172 knock can be fixed with a normal refresh/rebuild, I would like to put a head back on it that is not already cracked - even though it has been "fixed" with welding.

Will the 192 head fit without any issues, and will there be any performance differences, positive or negative when using a 192 head on the 172 motor? I would expect to refresh the head as well, but would not be planning on a lot of porting and extra grinding unless I'm told it is necessary.

Depending on what is wrong with each motor, I may end up using the entire 192 engine in the tractor which will make this a moot point. But my first preference is probably to keep the original motor but change the cracked head.

Any opinions? Thank you.

Frank
 
Hopefully Dean will respond to this. He has talked in the past about swaps of this nature and may have ideas of what it may do in terms of compression, etc.
 
I find no differences in the late 172 head and a 192 head. They have the same chamber size. The only difference between the engines is the bore size. 3.90 for the 172 and 4.130 for the 192. Crank,rods,cam are all the same. I'd just rebuild the 192. The early 172s had 7/16 head bolts the later 172s and the 192s are 1/2. The early head can have the bolt holes opened up to 1/2.
 

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