They could maount a mower engine no trouble.
Anywhere off the crankcase. its not like they are doing it with a hammer and chisel and could chance cracking the case.
The main issue is haing room on the table for the depth of the cylinder with the crankcase under it. Its twice as long as a motorbike or victa cylinder.
Will depend if the machine is for all engines or just small engines.
I would highly doubt it would be economicly viable to rebuild the GCV120. You could possibly find a good running used motor cheaper. Will depend on the cost of boring, i suppose. If you do it you will know what you have. What was a good super reliable Honda motor now full of fresh chinese parts.
