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The Peterson R4 four‑stage oil pump uses twisted‑lobe rotors and lightweight construction to produce reliable pressure and increased scavenge capacity while keeping package size small. Its internal scavenge manifold and shallow fittings yield compact installation. This left‑side mount, drag‑oriented R4 is specified at 1.2" pressure and 1.4" scavenge with rear‑drive provision for accessory options.
Peterson Fluid Systems R4 4-Stage Oil Pump - Left Side Mount - Rear Drive Drag
