With proper Lister adapters your engine will match up to SAE5 or SAE4 on the housing & SAE 6 1/2 at the drive hub. Stamford and LIMA both made certain models that either conform to this spec or are custom fitted for your Lister model. There is a problem with the clone heads in that they are not able to make the jump between SAE specs and Lister specs. I have gone over this with Tom as well as some Chinese engineers at point of manufacture more than once, and still having translation difficulties. Best bet seems to be use of the adapters and SAE standard specs.
dieselgman