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

Moroso -12AN Valve Cover Fitting #710-22635

JEGS Remote Oil Breather Tank #555-52200

JEGS -10AN to -12AN Hose Adapter #555-110168

JEGS -12AN Straight Swivel Hose Ends #555-100004

JEGS -12AN 90° Swivel Hose Ends #555-100024

JEGS -12AN Pro-Flo Braided Hose #555-100941