This is the base pump in the R4 line but that doesn't mean it doesn't perform amazingly. It fits most applications with it's 1.2" wide scavenge and pressure rotor. A 1.4" thick pressure rotor is available for engines that require higher oil flow such as aluminum blocks that are also running aluminum rods or iron block motors that are running mulitple oiling accessories such as valve train sprayers and wrist pin oilers. Comes with an integrated mount that can be attached to any of our block mount plates. We can also machine custom plates or make your own for custom applications.Peterson Fluid Systems Dry Sump Pumps are built around our Patent Pending 4 lobe rotor which provides excellent oil pressure and flow in excess of 30 GPM on the High Volume pump for the highest need motors. The 4 lobe rotor also provides excellent vacuum to free up horsepower in the engine. Pit Stop USA offers Peterson R4 Series 4 Stage Dry Sump Oil Pump - Rear Drive - Bert/Brinn Bellhousing Mount 20546 at low everyday prices. Be sure to check out all of our products from Peterson Fluid Systems including Peterson Fluid Systems Bellhousing Mount Oil Pumps.