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The Peterson R4 four‑stage oil pump combines twisted‑lobe rotors and lightweight construction to deliver robust pressure and scavenging with a minimal profile. Internal manifolds and shallow fittings minimize packaging issues while the scavenge sections create useful crankcase vacuum to reduce windage. This left‑side mount R4 is specified at 1.4" pressure and 1.2" scavenge and includes a rear‑drive provision for accessories.
Peterson Fluid Systems R4 4-Stage Oil Pump - Left Side Mount - HV - Rear Drive
