Billet Merc 454/502 Replacement Serpentine Pulley Kit

This is a beautifully polished precision machined billet direct replacment pulley set designed for your Mercury454/502 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 idler pulleys. This kit only fits engines originally equipped with a serpentine belt system. It is NOT designed to convert V-belts.

421-301K 454/502 Merc Replacement Serpentine Pulley Kit

Sea Pump Pulleys for Gen 4 & 5 Engines

All Hardin Marine Seapump 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 which will usually work themselves off.

625-4024 Gen 4 Single Pulley (mandrel not needed)
625-4025 Dual Groove For Std. Power Steering
625-4026 Dual Groove Crossover Mount 1 & 2 Stage Pumps
625-4027 Single Groove w/Offset for Crossover Style
625-4028 Dual Groove w/Offset for Crossover Style
421-205 Gen 5 Pulley (needs mandrel to mount)
625-4055 Gen 4 Serpentine Pulley 6-Rib (needs mandrel to mount)
421-205M Mandrel Only