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Engine Accessory Pulleys:

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Hardin Marine
Billet V-Groove Engine Pulleys
These are CNC machined from 6061T aircraft aluminum and highly polished. Custom colors are available by special order.
Part No. Description

421-201K

Mercury Pulley Kit for Gen 4 Engines
This kit includes: 1 - 3-groove crankshaft front pulley; 1 - sea pump pulley; 1 - power steering pulley with mandrel and an alternator pulley. Note: Please indicate what brand alternator you have for correct pulley.
421-202K

Mercury Pulley Kit for Gen 5 Engines
This kit includes: 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
 
This kit comes with 1 - crankshaft pulley; 1 - circulating pump pulley; 1 - sea pump pulley; 1 - power steering pulley; 1 - alternator pulley, and 1 - idler pulley. All pulleys are CNC machined and highly polished
Part No. Description
421-301K Mercury Billet Pulley Kit
Billet Mercury 496 Replacement Serpentine Pulley Kit
 
This is a beautifully polished and precision machined direct replacement billet pulley set designed for your late model Mercury 496 Mag or HO engines.  If your looking to add the ultimate in shine to your factory engine package, this is the answer.  This kit comes with (1) crankshaft pulley, (1) circulating pump pulley, (1) sea pump pulley, (1) power steering pulley, (1) alternator pulley and all idler pulleys.  This kit only fits engines originally equipped with a serpentine belt system.  It is NOT designed to convert V-belts.
Part No. Description
421-4961 Mercury 496 Billet Serpentine Pulley Kit (Up to 2004 Model Year)
421-4962 Mercury 496 Billet Serpentine Pulley Kit (2005 and Later Model Year)
Billet Serpentine Idler Pulleys
 
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
 
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
 
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
 
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
 
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
 
  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