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CP Performance Boaters Shopping and Product Info Guide
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Engine Accessory Pulleys

Click on the part number to check pricing or place an order.

Hardin Marine
Billet V-Groove Engine Pulleys
biller v-groove pulleys

These are CNC machined from 6061T aircraft aluminum and highly polished. Custom colors are available by special order.

Part No. Description Included
421-201K Mercury Pulley Kit for Gen 4 Engines
  • (1) 3-groove crankshaft front pulley
  • (1 ) sea pump pulley
  • (1) power steering pulley with mandrel
  • alternator pulley.
Note: Please indicate what brand alternator you have for correct pulley.
421-202K Mercury Pulley Kit for Gen 5 Engines
  • (1) 3-groove crankshaft front pulley
  • (1) sea pump pulley with mandrel for Gen 5 sea pump
  • (1) power steering pulley with mandrel and an alternator pulley.
Note: Please indicate what brand alternator you have for correct pulley.
Billet Serpentine Pulley Kit
serpentine pulley kit

This kit comes with:

  • (1) crankshaft pulley
  • (1) circulating pump pulley
  • (1) sea pump pulley
  • (1) power steering pulley
  • (1) alternator pulley
  • (1) idler pulley
All pulleys are CNC machined and highly polished

Part No. Description
421-301K Mercury Billet Pulley Kit
Billet Serpentine Idler Pulleys
serpentine idler pulley

This is the same billet idler pulley found in the high performance serpentine system manufactured by Hardin Marine. Each precision machined billet pulley is 3/4" in diameter and features oversized double row high RPM bearings. Available in a smooth belt surface or 6-rib version.

Part No. Description
625-8178 2-5/8" Smooth Idler Pulley
625-8179 2-5/8" Ribbed Idler Pulley

Billet Mercury Style 3-Groove Circulating Pump Pulley
3-groove pump pulley

This billet 3-groove pulley is designed as a replacement for popular Mercruiser applications while retaining the factory circulating pump.

Part No. Description
421-203 Billet 3-Groove Circulating Pump Pulley for Big Block Chevy
Alternator Pulley For Mando
pulley for mando

Hardin Marine makes the correct billet alternator pulley for your Mando alternator. Just slide yours off and replace it with the Hardin billet polished pulley.

Part No. Description
421-208M Mando Alternator Pulley (D Shaped Shaft)
421-208 Alternator Pulley (Standard Key Way Style Shaft)
755-3000 Delco Style Alternator Pulley (Round Shaft)
625-3130 Serpentine 6-Rib Alternator Pulley (Round Shaft)
625-3139 Aluminum Delco Style (Fan Only)
Sea Pump Pulleys For Gen 4 & 5
sea pump pulleys

All Hardin Marine Sea pump pulleys for Gen 4 & 5 v-groove bolt use a mandrel on the pump, then the pulley bolts to the mandrel. Some manufacturers sell you a press-on pulley, these usually work themselves off.

Part No. Description
625-4024 Gen 4 Pulley (mandrel not needed)
625-4025 Dual Groove Pulley for Std. Power Steering
625-4026 Dual Groove Crossover Mount for Single & Dual Stage Pumps
625-4027 Single Groove w/Offset for Crossover Style
625-4028 Dual Groove w/Offset for Crossover Style
625-4055 Gen 4 Serpentine Pulley 6-Rib (Needs Mandrel to Mount)
421-205 Gen 5 Pulley (needs mandrel to mount)
421-205M Mandel Only
Billet Power Steering Pulley
power steering pulley

These power steering pulleys mount with a mandrel so you can bolt the bolt to the mandrel. Some manufacturers have you press their pulleys on, these usually work themselves off due to belt heat & pump heat. Always use a mandrel for mounting.

Part No. Description
421-207 Power Steering Pulley V-Groove
421-207M Mandrel Only
1,2 And 3-Groove Billet Crankshaft Pulleys
crankshaft pulleys

These are billet crankshaft pulleys that are CNC precision machined from 6061 T-6 billet aluminum.

Part No. Description
421-202 Billet 3-groove Crankshaft Pulley for Big Block Chevy, Polished
421-841 Billet 1-groove Crankshaft Pulley for Big Block Chevy, Polished
421-843 Billet 2-groove Crankshaft Pulley for Big Block Chevy, Polished
421-856 Billet 2-groove Crankshaft Pulley for Oldsmobile, Polished
625-8100 Billet 2-groove Crankshaft Pulley for Big Block Chevy
with 6-bolt Supercharger Pulley Mount (Hard Coat Anodized Black)
625-8125 Billet 3-groove Crankshaft Pulley. Set up for a Mercury replacement with smaller center groove, Polished
625-8176 6-Rib Serpentine Crankshaft Pulley for Big Block Chevy (Mercury HP500 Engine Spacing), Polished