This is the best pump that we have found by far! 
CNC machined from alloy billets with sintered internals for exact standards. These close tolerance pumps produce consistantly high oil pressure even at high RPM. So finely engineered that there is less oil drag on the pump giving the potential for more horsepower. Internal parts can be ordered for rebuilding of the pump.
Always check the fitting bolt length. It they are too long they can keep the pump from sealing to the block.