Stuart, I think you are correct about the oil line- in the pictures it appears to connect to the back of the block, rather than near the center as it does with the older engines. That raises the question of whether the oil line is plugged or the camshaft bearing is installed incorrectly. A quick check on the bearing would be to disconnect the oil line at the block connection and run the engine to see what comes out of the port. Hopefully, a good squirt of oil. If not???
As I remember, the intake valve tips are quite a bit longer above the spring than are the exhaust tips- but that is a pretty foggy memory right now.
Harvester
