Assembly and drives

Assembly & Drives

Idler Assembly

Part # S/W5500

Idler Assembly for all Shaver-Wesmar Gear Drives.


Big Block Water Pump Drive Hub

Part # S/W-A127

Primarily used for sprint car engines that have a big block crank snout and drive the water pump off the front of the engine.


Small Block Water Pump Drive Hub

Part # S/W-A128

Used on engines with a standard snout crank size. Used to drive the water pump off the front of the engine.


Oil Pump Drive Hub

Part # DA102-26-0601

Used on engines that drive the oil pump off the front of the cam. Mainly used on sprint car engines.


big block water pump
drive hub

small block water pump
drive hub

Oil pump
drive hub

our advantages

Made In The USA

CNC Machined Heat Treated Gears with Precision Crown Shaved Teeth for smooth harmonic free operation. The whole unit weighs only 4 1/2 lbs. Comes Complete With Everything You’ll Need!

High Quality Materials

Made of ultra-light aluminum aircraft alloy. Crack resistant steel idler gear support. Gears precision cut from 9310 steel, with no more than a .001 total run out with 20 degrees pressure angle. Highly adjustable and easy to install.


Established by Ron Shaver and Bob Westphal in 1994 with over 70 years combined experience. Used by top engine builders, most reliable gear drive on market


Stopped by the booth at PRI and spoke with Kelly. Excellent product and 100% American made. Can't wait to get the BBC gear drive on our next engine!

Troy Smith, Engine Builder

Simply the best gear drives in the business, created by 2 of the best minds in engine building!

Lindsay Shaver, Racer