Goldie
Well-known member
Hi guys! It's me again! Still dealing with oil issues in our recent performance 200/aussie head/yella terra RR combo. No matter what we've tried, oil is still being sucked up into the carburetor. The valve cover fills with oil and the oil light comes on, indicating the pan is low on oil. Leakdown test has been done. All is good there. We have tried a combination of breathers and PCV valves. We have tried two different stock oil pumps. Oil pressure is fine (slightly high) at 27psi hot idle. We have also put in 60% restricted Smith Bros. pushrods to help keep some oil below the valve cover. We have tried a thinner viscosity oil. Nothing has helped. We have taken off the head, and don't see any visible restrictions. So, we will be pulling the engine and opening up the drain back holes in the block to help allow the oil to drain back to the pan. Do any of you know if there is a specific "spec" or bore diameter that we should use when opening up these ports? Don't want to assume that any amount will be good, or that "too much is just right". We have a ton of $$ into this engine and certainly don't want to destroy it.
Many thanks!
Many thanks!