Difference Between Oil Pumps

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Senior Member
Is their any way i can find out the difference between a GSR and a LS oil pump, cuz i got the two I have mixed up and I dont know which is which.
Look at the size of the rotors. The GSR should be moving higher pressure. Or if you are going to build silly Hp toss both sets and drop in a Pro-Drive set into the housing of your choice.