Billet Aluminum Pulley Kit for AMC/ Jeep / AMX engines. Hard to find Billet Aluminum Underdrive Pulleys for AMC / AMX / Jeep 304, 360 & 401 engines 1972 and later (4 bolt crank). Made in the USA on CNC lathes at ultra high speeds for an amazing surface finish and a nearly perfectly balanced pulley. Application 1) AMC and Jeep Engines 1976 and later (4 bolt crank) Pulley Kit Contents: Water Pump Pulley P/N AMCL3WP Grooves: 3 Pulley Diameter: 6.2" Pilot Diameter: 0.625" Overall Length: 2.7" Crankshaft Pulley P/N AMCL3CR Grooves: 3 Crank Pulley Diameter: 5.7" Bolt Pattern: 4 Bolt Overall Length: 3.5" Alternator Pulley P/N AMC1ALT Diameter: 2.7" Grooves: 1