Hardin Marine

Big Block Chevy -16 AN Polished Stainless Steel Water Inlet Plates
Your Price:
$129.99

Big Block Chevy -16 AN Polished Stainless Steel Water Inlet Plates

410-WP16

  • -16AN male flare fittings. 
  • Designed for Big Block Chevy Engines.
  • Constructed of Polished Stainless Steel.
  • Sold in Pairs.
  • Ideal for jet boats, v-drives and offshore installations using AN style fittings.

Small Block Chevy 3 V-Groove Crank Pulley
Your Price:
$109.99

Big Block Chevy 3 V-Groove Crank Pulley

421-215

BB Chevrolet 3 V-Groove Billet aluminum OEM style Crankshaft Pulley. This pulley fits Chevrolet 454 7.4L and 502 8.2L late model applications. Replaces Mercruiser Part #90081T1 and casting # 90081C.

Pulley Specifications:
  • 2.25" thick from damper face to front of pulley
  • 1st groove (alternator) 6.60" diameter
  • 2nd groove (sea pump) 5.05" diameter
  • 3rd groove (power steering) 6.60" diameter

Big Block Chevy -8 AN Polished Stainless Steel Water Inlet Plates
Your Price:
$70.99

Big Block Chevy -8 AN Polished Stainless Steel Water Inlet Plates

410-WP8

  • -8AN male flare fittings. 
  • Designed for Big Block Chevy Engines.
  • Constructed of Polished Stainless Steel.
  • Sold in Pairs.
  • Ideal for jet boats, v-drives and offshore installations using AN style fittings.

Big Block Chevy Closed Cooling Kit Up To 650HP
Your Price:
$1,799.99

Big Block Chevy Closed Cooling Kit Up To 650HP - Copper / Brass

625-4544

While there are numerous universal OEM closed cooling kits, this is not one of those. This is a true custom engineered and developed closed cooling system designed around traditional Std. deck height 9.8" Big Block Chevrolet applications. The kit is perfect for the 454 CID through 540 CID engines making up to 650 horsepower.We offer the closed cooling tank version in a paint-to-finish version and an upgraded polished stainless steel/Cupronickel core version for the ultimate in appearance and durability.The kit comes with tank, brackets, hoses, and thermostat housing.This High Performance Closed Cooling kit is designed for applications with horsepower levels to 650HP.

Big Block Chevy Closed Cooling Kit Up To 650HP
Your Price:
$2,499.99

Big Block Chevy Closed Cooling Kit Up To 650HP - Stainless Steel / Cupronickel

625-4543

While there are numerous universal OEM closed cooling kits, this is not one of those. This is a true custom engineered and developed closed cooling system designed around traditional Std. deck height 9.8" Big Block Chevrolet applications. The kit is perfect for the 454 CID through 540 CID engines making up to 650 horsepower.We offer the closed cooling tank version in a paint-to-finish version and an upgraded polished stainless steel/Cupronickel core version for the ultimate in appearance and durability.The kit comes with tank, brackets, hoses, and thermostat housing.This High Performance Closed Cooling kit is designed for applications with horsepower levels to 650HP.

NOTE: Shown Installed, kit includes Polished Tank and Brackets, hoses, clamps, thermostat, clamps & hardware.

Big Block Chevy Crossover Gasket
Your Price:
$3.99

Big Block Chevy Crossover Gasket

620-05112

Big Block Chevy Crossover Gasket


Big Block Chevy Crossover Style Serpentine Drive Kit
Starting From:
$2,999.99
This Part has options, please click the button below to order.

Big Block Chevy Crossover Style Serpentine Drive Kits

625-82 + Option(s)

Big Block Chevy Crossover Style Serpentine Drive Kit

Whether you're building a new power plant for your boat or you're like many and are ready to step from the stone age of traditional V-Belts to the modern long lasting and quiet operation of serpentine style drive system then Hardin Marine has the ultimate solution.  Serpentine systems are available in either a crossover water inlet style or the factory circulating pump version.  The comes complete with sea pump as well as a factory style circulating water pump (if called for), a 94 amp high-output chrome alternator, specially valved power steering pump, all billet brackets and mounts as well as stunningly polished precision CNC machined drive pulleys and matching idlers.  The kit will also include the correct mounting hardware and serpentine drive belt for the smoothest of installations.  Hardin Marine is leading the way with the latest in boating technology.


Big Block Chevy Custom Fabricated Water Outlet
Your Price:
$399.99

Big Block Chevy Custom Fabricated Water Outlet

410-1495

  • Constructed of 316L Stainless Steel.
  • Designed to fit a Big Block Chevrolet engine application.
  • Used in Hardin Marine #625-8186, #625-8187 & #625-8189 Drive Kits
  • May require plumbing modifications in other applications.
  • Features (1) 1-3/4", (2) 1", and (1) 1-1/4" push on hose connections.
  • (2) Alternate 1/8" NPT steam or bypass ports, plugs included.
  • Includes bolts and gaskets.

Big Block Chevy Extra Thick Bolt Xtreme Marine Seal™ Valve Cover Gasket
Your Price:
$25.99

Big Block Chevy Extra Thick Bolt Xtreme Marine Seal Valve Cover Gasket

300-182

Big Block Chevy Extra Thick Bolt Xtreme Marine Seal™ Valve Cover Gasket- Sold in Pairs

There is nothing more frustrating than a leaking valve cover seal, so don't settle for anything less than the best. That's why professional engine builders nationwide demand Xtreme Marine Seal valve cover gaskets. Produced from a blend of polymer and cork to provide a gasket that will last.

Sold in Pairs


Big Block Ford Fuel Pump and Regulator Kit
Your Price:
$219.95

Big Block Chevy Fuel Pump and Regulator Kit

620-454

Combine and Save with this Fuel Pump and Regulator Combo Kit.
    This kit includes:
  • A High Performance mechanical fuel pump
  • A Holley 12-803 Chrome Fuel pressure regulator
Pump has 1/2" NPT inlet/outlet. 130 GPH and 14-16 PSI

Big Block Chevy Fuel Pump Gasket
Your Price:
$1.99

Big Block Chevy Fuel Pump Gasket

620-05115

For use on Big Block Chevrolet fuel pumps.

Big Block Chevy Gen 4 "XS" Series Offshore Oil Pan
Starting From:
$549.99
This Part has options, please click the button below to order.

Big Block Chevy Gen 4 "XS" Series Offshore Oil Pan

420-9105 + Option(s)

Big Block Chevy Gen 4 "XS" Series Offshore Oil Pan - (Pan, oil pick-up & windage tray only)

The "XS" Xtreme Series 4-5/8" stroker oil pans are competition tested and race proven. They out perform all other pans available. Each pan starts out jig formed and precision TIG welded, then an exclusive race proven windage tray is added which prevents oil foaming and crankshaft windage, which helps to build more horsepower. Next a high volume oil pump pick-up with a support bracket is added. The entire pan is coated with a hardened aerospace epoxy to resist stains and corrosion. Designed to clear most front style engine mounts including MerCruiser. A simple comparison of available marine oil pans clearly points out Hardin Marine oil pans are boat lengths ahead of all other oil pans. Run what leading racers worldwide already use - the Hardin Marine "XS" Xtreme Series offshore oil pan.


Big Block Chevy Gen 4 "XS" Series Offshore Oil Pan - Complete Kit
Starting From:
$629.99
This Part has options, please click the button below to order.

Big Block Chevy Gen 4 "XS" Series Offshore Oil Pan Kit

620-9105 + Option(s)

  • Reinforced Sea Pump/Alternator Adjusting Bracket Tab.
  • Extra Large 10 qt. (8.9" Deep) & 12 qt. (10" deep) pans.
  • Pan rear support spacers provided added clearance to mounting fasteners.
  • 1/4" NPT threaded flexible dipstick provides a leak proof seal between dipstick and pan.
  • Heavy duty pan rails are notched to allow 4-5/8" stroke rotating assemblies.
  • "T" bottom style offers additional oil capacity storage for constant supply to the engine oil pickup.
  • Zinc plated one-piece windage tray and crank scraper prevents oil foaming, building more power than other brands.
  • Highly flexible dipstick allows accessibility around engine mounts and exhaust systems.
  • Oil relief in kick out allows added room for long filters and sandwich adapters.
  • Fully gusseted high-flow oil pick-up included.
  • Includes mounting bolt kit.
  • Welded for durability.
  • 1/2"-20 drain plug.

Big Block Chevy Gen 4 & 5 Timing Cover Gasket
Your Price:
$25.99

Big Block Chevy Gen 4 & 5 Timing Cover Gasket

300-17872

Big Block Chevy Gen 4 & 5 Timing Cover Gasket- Sold Each

These Hardin Marine Sea timing/front cover gaskets are designed to exceed all original equipment specifications. Each gasket is precision die-cut for a perfect fit every time.

Sold Each


Big Block Chevy Gen 4 Oil Pan Bolt Kit
Your Price:
$27.99

Big Block Chevy Gen 4 Oil Pan Bolt Kit

620-52008

Stainless Steel Bolt Kits - B/B Chevy Gen 4 Oil Pan Bolt Kit
We offer a full selection of manifold bolt kits to fit most popular marine engines.  These kits come complete with the correct number of


Big Block Chevy Gen 4, 2-piece Rear Main Seal
Your Price:
$19.99

Big Block Chevy Gen 4, 2-piece Rear Main Seal

300-16875

Big Block Chevy Gen 4, 2-piece Rear Main Seal- Sold Each

These excellent rear main seals are designed to replace worn, deteriorated original equipment seals and provide years of trouble free service

Sold Each


Big Block Chevy Gen 4, 5 & 6 Front Seal
Your Price:
$16.99

Big Block Chevy Gen 4, 5 & 6 Front Seal

300-16872

Big Block Chevy Gen 4, 5 & 6 Front Seal- Sold Each

These excellent front timing cover seals are designed to replace worn, deteriorated original equipment seals and provide years of trouble free service

Sold Each


Big Block Chevy Gen 4/5 Timing Cover Bolt Kit
Your Price:
$17.99

Big Block Chevy Gen 4/5 Timing Cover Bolt Kit

620-52004

Stainless Steel Bolt Kits - B/B Chevy Gen 4/5 Timing Cover Bolt Kit
We offer a full selection of manifold bolt kits to fit most popular marine engines.  These kits come complete with the correct num


Big Block Chevy Gen 5 & 6 Side Entry Remote Cooler Sandwich Adapter
Your Price:
$99.99

Big Block Chevy Gen 5 & 6 Side Entry Remote Cooler Sandwich Adapter

625-7917

Big Block Chevy Gen 5 & 6 Side Entry Remote Cooler Sandwich Adapter

These unique adapters are used when a filter is desired to be used in a block mounted fashion. This unit lowers the original filter location by 1-1/2" while providing 3/4" NPT inlets and outlets. The factory oil by pass is eliminated in this situation.


Big Block Chevy Gen 5 & 6 Thermostatically Controlled Engine Block Adapter
Your Price:
$279.99

Big Block Chevy Gen 5 & 6 Thermostatically Controlled Engine Block Adapter

625-7704

Big Block Chevy Gen 5 & 6 Thermostatically Controlled Engine Block Adapter

Thermostatically Controlled Engine Block Adapter Gen 5/6 BBC

Maintaining proper engine oil temperature has become critical to the success or failure of today’s performance marine engines. Prolonged use of marine engines in conditions where oil cannot reach its optimum working temperatures will result in sludge formation and crankcase dilution which leads to excessive wear especially in the cylinder bores and bearing surfaces. A thermostat assembly combats this by permitting 90% of the engines oil to bypass the cooler during warm up. The balance of the oil flow is allowed to fl ow through the cooler maintaining constant pressure and preventing air pockets while eliminating cold oil shock. This reduces scuffing and premature wear and inhibits engine blow-by. As engine oil temperature reaches its optimum operating temperature moisture and impurities that often cause a milky condition are eliminated.

Until now oil temp was controlled either by some guess of components or by the professional engine builders through the use of some sort of external engine oil thermostat. While these external oil filter/ thermostats were very effective they were also very large and very bulk . Making them hard to mount and creating a maze of plumbing. The problem was the only available parts up until now couldn’t move the necessary oil fl ow to be mounted anywhere. else. But thanks to Hardin marine and their engineering staff they took to solving this decade long nuisance. Hardin Marine has developed this new thermostatically controlled engine block mounted product. With this unit all oil temperature is now controlled through a integral 212 degree oil thermostat. The large 3/4NPT oil inlets/outlets assure the maximum amount of oil can be fl owed through the unit. So no more maze of external plumbing, no more big bulky external mounted components just the standard (2) lines to the filter and the standard (2) lines to your cooler. Sometimes evolution comes in the form of the simplest of things but this is one that has been deeply sought after. Overall Height: 4-3/4"



Big Block Chevy Gen 5 & 6 1-piece Rear Main Seal
Your Price:
$28.99

Big Block Chevy Gen 5 & 6 1-piece Rear Main Seal

300-16876

Big Block Chevy Gen 5 & 6 1-piece Rear Main Seal- Sold Each

These excellent rear main seals are designed to replace worn, deteriorated original equipment seals and provide years of trouble free service

Sold Each


Big Block Chevy Gen 4 "XS" Series Offshore Oil Pan
Starting From:
$549.99
This Part has options, please click the button below to order.

Big Block Chevy Gen 5/6 "XS" Series Offshore Oil Pan

420-9105 + Option(s)

Big Block Chevy Gen 5/6 "XS" Series Offshore Oil Pan - (Pan, oil pick-up & windage tray only)

The "XS" Xtreme Series 4-5/8" stroker oil pans are competition tested and race proven. They out perform all other pans available. Each pan starts out jig formed and precision TIG welded, then an exclusive race proven windage tray is added which prevents oil foaming and crankshaft windage, which helps to build more horsepower. Next a high volume oil pump pick-up with a support bracket is added. The entire pan is coated with a hardened aerospace epoxy to resist stains and corrosion. Designed to clear most front style engine mounts including MerCruiser. A simple comparison of available marine oil pans clearly points out Hardin Marine oil pans are boat lengths ahead of all other oil pans. Run what leading racers worldwide already use - the Hardin Marine "XS" Xtreme Series offshore oil pan.


Big Block Chevy Gen 5/6 "XS" Series Offshore Oil Pan Kit
Starting From:
$629.99
This Part has options, please click the button below to order.

Big Block Chevy Gen 5/6 "XS" Series Offshore Oil Pan Kit

620-9105 + Option(s)

  • Reinforced Sea Pump/Alternator Adjusting Bracket Tab.
  • Extra Large 10 qt. (8.9" Deep), 12 qt. (10" deep) pans and 14 qt (10.18" deep)
  • Pan rear support spacers provided added clearance to mounting fasteners.
  • 1/4" NPT threaded flexible dipstick provides a leak proof seal between dipstick and pan.
  • Heavy duty pan rails are notched to allow 4-5/8" stroke rotating assemblies.
  • "T" bottom style offers additional oil capacity storage for constant supply to the engine oil pickup.
  • Zinc plated one-piece windage tray and crank scraper prevents oil foaming, building more power than other brands.
  • Highly flexible dipstick allows accessibility around engine mounts and exhaust systems.
  • Oil relief in kick out allows added room for long filters and sandwich adapters.
  • Fully gusseted high-flow oil pick-up included.
  • Includes mounting bolt kit.
  • Welded for durability.
  • 1/2"-20 drain plug.

Big Block Chevy Gen 5/6 Oil Pan Bolt Kit
Your Price:
$27.99

Big Block Chevy Gen 5/6 Oil Pan Bolt Kit

620-52007

Stainless Steel Bolt Kits - B/B Chevy Gen 5/6 Oil Pan Bolt Kit
We offer a full selection of manifold bolt kits to fit most popular marine engines.  These kits come complete with the correct number o


Big Block Chevy Gen 6 O-ring Xtreme Marine Seal™ Valve Cover Gasket
Your Price:
$32.99

Big Block Chevy Gen 6 O-ring Xtreme Marine Seal Valve Cover Gasket

300-17937

Big Block Chevy Gen 6 O-ring Xtreme Marine Seal™ Valve Cover Gasket- Sold in Pairs

There is nothing more frustrating than a leaking valve cover seal, so don't settle for anything less than the best. That's why professional engine builders nationwide demand Xtreme Marine Seal valve cover gaskets. Produced from a blend of polymer and cork to provide a gasket that will last.

Sold in Pairs


Big Block Chevy Gen 6 Timing Cover Bolt Kit
Your Price:
$15.99

Big Block Chevy Gen 6 Timing Cover Bolt Kit

620-52003

Stainless Steel Bolt Kits - B/B Chevy Gen 6 Timing Cover Bolt Kit
We offer a full selection of manifold bolt kits to fit most popular marine engines.  These kits come complete with the correct numbe


Big Block Chevy Gen 6 Timing Cover O-ring
Your Price:
$19.99

Big Block Chevy Gen 6 Timing Cover O-ring

300-17870

Big Block Chevy Gen 6 Timing Cover O-ring- Sold Each

These Hardin Marine Sea timing/front cover gaskets are designed to exceed all original equipment specifications. Each gasket is precision die-cut for a perfect fit every time.

Sold Each