Cylinder Head

just the head? that should not be a problem, surely. where is the interference?

or are you having difficulties with the rocker boxes? the head bolts on the right side interfere with the upper frame tube. if you remove the motor mount bolts the thing can be tipped to the right to get clearance.

 

Never had issues with pushrods being fitted other than some tubes have a disc in them with holes for the pushrods and these can be opened up to help out.

 

Most people throw away the early type tube and replace with later ones without the disc, nice your engine still has them

 

you can get the clearance you need without modifying any parts just by tipping the motor left or right in the frame.

interesting about the disc. i've never seen one over here in the states. can you post a picture of it?