Thanks for the info. I am located in north central Il. I have a friend that has a 4020 with a spun bearing and was looking for another motor for it. I think he might swap engines and rebuild the original engine at a later time and put it back in. He said he wants to keep the tractor original but money is to tight now.
that reminds me, we had to notch the block on the bell housing for the throttle linkage, also, if the tractor has 2 scv's the exhaust manifold will not fit. we had to cut them apart and weld two pieces together to make it fit