The Stovebolt Site Forums The Shop Area Engine Shop i have a theory - rocker valve oil pipe mods

original pipe open ended. pipe curves up over rocker shaft height then down where it dumps oil into the rocker head.
because the highest part of this pipe is above the rocker arm saft the shaft remains full of oil, bleeding out oil through the small holes in the rocker arms.

pre detergent oil use the small oil pipe feeding the rockers can easily clogg at low flow rates so the pipe is left open ended to maximise the oil velocity through the pipe and preventing clogging. post detergent oil use pipe end can be closed to maximise flow through rockers but causes a reduction in oil velocity thru the pipe.


now....use non detergent oil on engine with a closed pipe end and you have lower oil velocity through pipevand higher chance to clog....as they do.


so never use closed pipe end mod with non deteregent oil. risks of clogging and associated oil flow loss greatly outweighs assumed increased oil flow.

just something i was pondering on whilst drinking - and i am quite drunk so....might notnhavevexplainbed myself clearly