22641 ORIGINAL DESIGN 4 VANE VACUUM PUMP 

The nature of a vacuum pump is to remove air, blow-by gasses and other contaminants from the crankcase of an engine. Crankcase vacuum will increase horsepower by allowing the use of low-tension compression and oil control rings. In which the use of reduces frictional horsepower losses, blow-by, intake charge contamination and aids in detonation prevention. Moroso’s  “purpose built”  racing pumps offer all these advantages and more. Whether you have a normally aspirated Small Block or a nitrous equipped Pro-Mod, one of Moroso’s vacuum pump offerings with all the needed accessories has you covered. These pumps will suit nearly any engine combination and requirement.

• Billet aluminum design
• 4-vane can achieve greater vacuum sooner than comparable 3-vane
• Durable vane material for improved efficiency and wear
• Easy serviceability
• Mounting bracket not included
• 4.150" O.D. body, 5.900" from back of pump to pulley mounting flange