I ask this question generally since I admittedly don't quite understand it all conceptually; what is too much oil to the top end of the engine? Obviously different engines have different operating pressures and whatnot. But provided that there is sufficient drain back, and provided the oiling of the top end doesn't starve any other areas of oil, can there be too much oil to the rockers? The thread on the Y block got me thinking about the topic. We're all familiar with engines like the SBC that oil the rockers through the lifters via hollow pushrods. It brings a lot of oil up the rockers, and oils not only the tip of the rocker where it meets the pushrod, but also the fulcrum as well. On the other end of the spectrum, it seems like you have the Olds Rocket and Ford Y Block, where you could stand-in a white dress shirt with confidence next to a running engine with no valve covers. I've heard folks say that you can flood the top of an engine with oil, but provided you have enough pressure and drain back, that seems somewhat counter to what I've always understood to be the case, where a steady supply of clean oil promotes lubricity and reduces heat and wear. I've always understood that the oil pump will pump oil at a given volume until it reaches a certain pressure, at which point it will bypass to bleed off the excess. Could a higher volume pump compensate for additional rocker oiling? And will a roller rocker require less oil than a standard bushed rocker?