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The stock oil pump is a great piece for up to 7,000 rpm. Past that, there can be cavitation issues and oil pressure drops as temperatures rise. Our ported pump increases flow by 25% and will allow continuous use above 9,000 rpm. We start with a brand new OEM oil pump from Honda, disassemble, port and smooth oil passages to increase flow.
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Immaculate work done by 4Piston
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Orion · August 1, 2026
Aloha from hawaii I Ordered this oil pump For my d series turbo build and they was quick and right on 4 P racing thank you for the great product and would love a sticker from 4 piston racing