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The Peterson R4 four‑stage oil pump uses twisted‑lobe rotors and lightweight construction to sustain oil pressure and multiple scavenge stages with a compact profile. Its internal scavenge manifold and shallow fittings make it adaptable to tight engine bays while scavenging reduces windage. This bell‑housing mount R4 is specified at 1.2" pressure and 1.2" scavenge and includes rear‑drive provision for accessories.
Peterson Fluid Systems R4 4-Stage Oil Pump - BH - Rear Drive
