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Manifolds & Accessories - OSCO

2- Groove Billet Crankshaft Pulley For Big Block Chevy
Your Price:
$189.99

496/ 8.1L Billet Crankshaft Pulley

421-231

This billet aluminum crankshaft pulley is black anodized and replaces the original and now discontinued painted steel OEM versions from Mercury.


Big Block Chevy Generation 4 Sea Pump Pulley
Your Price:
$119.99

Big Block Chevy / Small Block Chevy Generation 4 Sea Pump Pulley

625-4024

Big Block Chevy / Small Block Chevy Generation 4 Sea Pump Pulley

All Hardin Marine sea pump pulleys for Gen 4 V-groove belts 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.  This needs a mandrel to mount.

Pulley diameter of 6.5".


2- Groove Billet Crankshaft Pulley For Big Block Chevy
Your Price:
$78.99

Big Block Chevy 2-Groove Billet Crankshaft Pulley

421-843

2-Groove Billet Crankshaft Pulley For Big Block Chevy

  • Machined from 6061-T6 billet aluminum. 
  • Set up for a Mercury replacement with deeper v-groove. 
  • Comes highly polished.
  • Diameter of 6.5"
  • Pilot Hole is 1-1/8"

Small Block Chevy 3 V-Groove Crank Pulley
Your Price:
$96.99

Big Block Chevy Billet Small Diameter Crank Pulley

740-64201

Big Block Chevy Billet Small Diameter Crank Pulley - Machined from solid billets of the highest-grade aircraft aluminum for maximum durability and feature deep, precision-machined groove to ensure belt retention, even during extreme changes in engine rpm. These pulleys have a black anodized hard-coat for extended life and corrosion resistance . Diameter 5.250".


Billet 496 / 8.2L Mercury Serpentine Pulley Kit - Late Style
Your Price:
$629.99

Billet 496 / 8.2L Mercury Serpentine Pulley Kit - Late Style

421-226

These billet aluminum pulleys are black anodized and replace the original and now discontinued painted steel OEM versions from Mercury.

Fits:

  • 496 Mag base & HO: 0W310000 & up
  • 496 Mag EC Base & HO: 1A066164 thru 1A350440.
  • 496 HO bravo: 1G400000 & up.
  • 8.2 Mag base & HO: 1S351597 & up.
  • 8.2 Mag EC base & HO: 1A350340 & up.

Kit includes:

  • Crank pulley
  • Circulation pump pulley
  • Alternator pulley
  • 17mm shaft power steering pulley & hub

Kit does not include:

  • 625-4278 sea pump pulley
  • 625-8178BK smooth idler pulley

Billet 496 Mercury Serpentine Pulley Kit - Early Style
Your Price:
$629.99

Billet 496 Mercury Serpentine Pulley Kit - Early Style

421-225

These billet aluminum pulleys are black anodized and replace the original and now discontinued painted steel OEM versions from Mercury.

Fits 496 Mag Base & HO:

  • 0M025000 thru 0M687082
  • 0M687082 thru 0W059999
  • 0W060000 thru 0W309999

Kit includes:

  • Crank pulley
  • Circulation pump pulley
  • Alternator pulley
  • 19mm shaft power steering pulley & hub

Kit does not include:

  • 625-4278 sea pump pulley
  • 625-8178BK smooth idler pulley
  • 625-8179BK ribbed idler pulley
  • If using these idlers you will need to purchase a smaller belt.

3-Groove Billet Crankshaft Pulley For Big Block Chevy
Your Price:
$119.95

Billet Aluminum Circulating Water Pump 3 Groove V-Belt Pulley

421-217

Chevy V6/V8 Billet Aluminum Circulating Water Pump 3 Groove V-Belt Pulley

This beautiful show quality pulley is machined from 6061-T6 Aluminum and polished to a high lustre. This pulley is Direct replacement for Mercruiser pulley 15120T and fits all 4.3L-V6, 305/350 V8, as well as 454/502 BBC V8's. The diameter is 5.5" and the mounting bolt centers are 2-1/8"


Billet Serpentine Idler Pulleys - 3-1/4" Ribbed Idler Pulley
Starting From:
$83.99
This Part has options, please click the button below to order.

Billet Serpentine Idler Pulleys - 3-3/16" Ribbed Idler Pulley

625-8179 + Option(s)

Billet Serpentine Idler Pulleys - 3-3/16" Ribbed Idler Pulley

Each precision machined billet pulley is 3-3/16" in diameter and features oversized high RPM bearings. Used with 17mm idler spacer or boss.


Billet Serpentine Idler Pulleys - 3-1/4" Smooth Idler Pulley
Starting From:
$105.99
This Part has options, please click the button below to order.

Billet Serpentine Idler Pulleys - 3-3/16" Smooth Idler Pulley

625-8178 + Option(s)

Billet Serpentine Idler Pulleys - 3-3/16" Smooth Idler Pulley

Each precision machined billet pulley is 3-3/16" in diameter and features oversized high RPM bearings.  Used with 17mm idler spacer or boss.


Billet V-Groove Engine Pulley Kit For Mercury Big Block Chevy Generation 5 & 6
Your Price:
$487.99

This Part has options, please click the button below to order.

Billet V-Groove Engine Pulley Kit For Mercury Big Block Chevy Generation 5 & 6

421-202K

Billet V-Groove Engine Pulley Kit For Mercury Big Block Chevy Generation 5 & 6

This kit includes:

  • (1) 3-groove crankshaft front pulley
  • (1) Sea pump pulley
  • (1) Power steering pulley with mandrel
  • (1) Alternator Pulley. D Shaped Shaft

At Hardin Marine we manufacture the finest high speed deep groove engine pulleys available. Each pulley is manufactured from 6061-T6 billet aluminum using Tru-Trac technology. Tru-Trac allows the V-belt to ride deep in the belt groove for maximum belt contact. Both the power steering and sea pump pulley use mandrel mounting features that protect the pulley from undue shaft heat. The most common cause for failure in lesser quality pulleys is caused from heat transferring to the pulley releasing from the shaft causing undue damage and safety hazards. All Hardin Marine shaft mount style pulleys use mandrels assuring you the best money can buy.


Double Groove Alternator Pulley
Your Price:
$59.95

Double Groove V-Belt Alternator Pulley

421-219

Double Groove V-Belt Alternator Pulley for use on alternators with round pulley shaft. 2-5/8" OD. Fits a .670" Round Shaft.


Gen 7 496 Sea Pump Pulley
Your Price:
$179.99

Gen 7 350, 496, 502 Mag Sea Pump 7" Axius Pulley and Mandrel Kit - Black

625-4312

Replacement 496 Sea Pump Axius 7" Pulley and Mandrel Kit

This billet pulley is designed as a replacement for popular MerCruiser Axius applications. Will fit stock MerCruiser or Hardin Gen 7 Pump. For 350, 496, 502 Mag with 7" diameter Axius pulley applications only. Includes mandrel and bolts.

Gen 7 496 Sea Pump Pulley
Your Price:
$159.99

Gen 7 350, 496, 502 Mag Sea Pump Pulley and Mandrel Kit - Black

625-4278

Replacement 496 Sea Pump Pulley and Mandrel Kit

This billet pulley is designed as a replacement for popular MerCruiser applications. Will fit stock MerCruiser or Hardin Gen 7 Pump. For 350, 496, 502 Mag with 5-3/4" diameter pulley applications only. Includes mandrel and bolts. This kit includes #13 - #16 on the Gen 7 Sea Pump Breakdown. Replaces OEM Mercury# 8M0150724.

Gen 4 Serpentine Pulley 6-Rib
Your Price:
$169.99

HP500 Serpentine Pulley 6-Rib

625-4055

HP500 / Hardin Drive Kit Serpentine Pulley 6-Rib (Needs Mandrel to Mount)

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. This pulley is for HP500 engines, and Hardin Marine Drive Kits only.

Note:  Mandrel Sold Separately.


Hub, Xover P/S Pump-Pulley
Your Price:
$48.99

Hub, Xover P/S Pump-Pulley

625-8107

Hub, Xover P/S Pump-Pulley

Power steering pump mandrel. Fits late model power steering pumps with plastic reservoir, and krc style pumps, both with a 0.669" diameter shaft.


Mandrel For Power Steering Pulley
Your Price:
$36.99

Mandrel For Power Steering Pulley

421-207M

Mandrel For Power Steering Pulley

This Mandrel presses on the pumps drive shaft and allows for easy bolting up of the 421-207 pulley. 

Fits saginaw style power steering pumps with 3/4 dia. shafts.

Mandrel For Sea Pump Pulley
Your Price:
$36.99

Mandrel For Sea Pump Pulley

421-205M

Mandrel For Sea Pump Pulley


Merc EFI Ribbed Idler Pulley 4.42" Diameter
Your Price:
$119.99

Merc EFI Ribbed Idler Pulley 4.42" Diameter

625-8223

Billet Serpentine Idler Pulleys - Merc EFI Ribbed Idler Pulley 4.42" Diameter


Mercury 600/662/700 Upper Blower Pulley 3.50
Starting From:
$299.99
This Part has options, please click the button below to order.

Mercury 600 / 662 / 700 Upper Blower Pulley

625-822 + Option(s)

Mercury 600/662/700 Upper Blower Pulley

Billet aluminum blower pulley, 3.25" or 3.50" diameter. NOTE: The 3.50" pulley has slots cut in the pulley face while the 3.25" pulley does NOT have the slots cut in the pulley face.

S/C BBC 3 Groove Crank Pulley
Your Price:
$229.99

S/C BBC 3 Groove Crank Pulley

421-218

S/C BBC 3 Groove Crank Pulley

  • BBC 3grv crank pulley for Supercharger application.
  • Will fit either 3 or 6 bolt damper.
  • 5.40 outside diameter by 2.350 thick

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