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Increase Crankcase Vacuum Extra vacuum boosts power by: improving ring seal; preventing blow-by, intake charge contamination, and detonation; and allowing the use of low-tension piston rings for less friction. These purpose-built vacuum pumps offer such power advantages in three designs to accommodate any engine combination and requirement. Use Moroso replacement pump fittings only. Moroso Vacuum Pump FAQs.
Original
3 or 4-vane pump
Billet aluminum housing
Pulls much more vacuum than stock smog pumps
Special vane material for improved seal and wear
-12AN inlet/outlet fittings won't leak
Rebuildable in 15 minutes
Mounting bracket sold separately (bolts directly to small or big block Chevy heads & any motor plate)
Enhanced
4-vane pump
Anodized or natural exterior
Pulls 13.9% more vacuum and does so sooner
Weighs 12 oz less and measures 1" shorter than Original design
Sealed, maintenance-free bearings
Mounting bracket and -12AN fittings included
Belt length may change depending on mounting location (new belt may be required)
Pro Mod
4-vane pump
Achieves much greater vacuum sooner
Flows up to 150% more air volume at low RPMs
Capable of up to 26 inches of vacuum
Rotor is keyed to shaft, eliminating fastener failure
Pump weighs 7 lbs, 8 oz (with bracket and fittings)
Sealed, maintenance-free bearings
Billet bracket and -16AN beaded fittings included (bracket mounts to motor plate & rotates 360°)
For small or big block Chevy, a Racing Vacuum Pump EZ Complete Kit includes:
Moroso Original 3-Vane Racing Vacuum Pump #710-22640
Moroso Vacuum Pump Mounting Bracket #710-63910
Moroso Gilmer 28-tooth Pulley #710-64886
Moroso SB (#710-63845) or BB-Chevy (#710-63844) Vacuum Pump Drive Kit
For small or big block Chevy, a Racing Vacuum Pump EZ Complete Kit includes:
