Hello All, well just began to get my 73 850 ready, primary chain a little tight, camchain (feeling through the hole in my Mk III Cover) far too tight. I couldn't even find a loose spot caused by the cam not being on lobe. Of came the cover and I found the spring of the cam seal stuck to the cover. I mounted the intermediate plate I got from AN but can not find the correct way to set the 4.5 mm play. If the cam is opening a valve should the mesurement be made pushing the chain down and then lifting it. Another question on the oil pump was a large flat washer, I had earlier bought the conical seal which I had been told should be used on the Mk III Cover. Is this correct or do I need the flat sealing washer?