Dennis P
Member
On the left rear corner of the block on the surface that the rear cylinder sits, there is a hole that goes into the crankcase. This is where the copper oiling line for the valves should terminate, but doesn't due to the hole drilled into the crank case. The front line does not have this & terninates at the gasket at the front left corner. Why is the rear not the same? It looks to me like a huge pressure drop on the upper oiling system. I think that I should plug this which would increase pressure all the way back to the rod bearings. I will try to post picture to better explain. Thanks!