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A high volume pump will sent more oil to the top, and which in a hyr cam is what you want, it is not going to push that much oil at the valve train, but in a solid roller it does push a lot of oil at the top, which is what mine is doing right now, but I have restrictor pushrods, .040" in each one. I shift at 7200rpms on the juice, and going down the track it has 80psi of oil. This last time I took apart the motor, there were no signs of oil starvation, but oil not getting out of the main bearings quick enough, the reason for the 3/4 groove HP bearings. About the the oil pump robbing HP, in a stock car yes, but in a motor like mine I have not seen it, another thing, you do not need an oil cooler with a high volume pump, lotsa people think of that, but the warmer the oil more hp. You want the oil temp at 150-180* when a pass is been done. Depending on the clearences the engine has, that is when the standard of HV pump is decided to use.
Edgar
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