The valve guides may very well be worn to the point of allowing oil to essentially drain down the valve stem. The seals for these motors consist of a small single rubber ring on the valve just below the keeper groove. They last about 4 hours. Kidding of course but I have never taken a 235 or 261 apart that had those seals intact in 40 plus years. So if you are sure you are running the correct rockers for the motor, try replacing the valve stem seals. If that does not do it, then a freshening up of the valve head may be in order.
Last edited by Dragsix; 09/12/2024 5:54 PM.
