[AT] Pushrods bending Farmall B engine

[toma]

My son and I are resurecting an IHC 55 W baler. It has the same basic 
engine as a Farmall B. The engine sat with the exaust manifold full of 
water for some time. Fortunately only one cylinder got water in it. We got 
it freed up but the head was severely rusted. We broke 2 valve guides 
trying to get the valves out. We replaced the head with one off a Farmall 
B. The engine runs well but smokes from that one cylinder that was stuck. 
The worrisome thing is we have had pushrods bend 2 times now. The first 
time Bob thinks he may have had the adjustment wrong and the pushrods were 
able to pop out. The second time an intake valve stuck open and the 
pushrod came out and bent. I am wondering if there are subtle differences 
between the industrial model engine on the baler and the A/B tractor 
engine that could account for this or if anyone else has had pushrod 
problems with these engines. The only difference I can see is the baler 
engine had exaust valve rotators and the rockers were pressed steel. The 
head we put on has no rotators and the rockers are a cast of some kind but 
appear to be the same dimensions. We also have two styles of pushrods but 
they seem to be interchangable. We are not trying to restore this engine 
to as new condition at this time, just trying to get it running 
dependably. We will probably only bale 500 bales a year with it but we 
don't want it to break down in the middle of it.