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The Peterson R4 four‑stage oil pump applies the twisted‑lobe rotor concept to deliver reliable pressure and scavenge capacity while minimizing mass with aluminum components. Internal scavenge passages and shallow fittings keep the package compact and effective at creating crankcase vacuum. This right‑side mount R4 is specified at 1.2" pressure and 1.2" scavenge with rear‑drive capability for accessory integration.
Peterson Fluid Systems R4 4-Stage Oil Pump - Right Side Mount - Rear Drive
