Hardin Marine

Big Block Ford Header Bolt Kit
Your Price:
$26.99

Big Block Ford Header Bolt Kit

620-52102

Stainless Steel Bolt Kits - B/B Ford Header 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 bolts


Big Block Ford Intake Manifold Stainless Steel Allen Bolt Kit
Your Price:
$30.99

Big Block Ford Intake Manifold Stainless Steel Allen Bolt Kit

620-52101

Big Block Ford 429/460 Intake Manifold Stainless Steel Allen Bolt Kit

We offer a full selection of intake manifold bolt kits to fit most popularmarine engines. These kits come complete with the correct number of bolts andstainless steel washers. Don't install your new intake manifold with anythingless.


Big Block Ford Steel Valve Cover Bolt Kit
Your Price:
$16.99

Big Block Ford Steel Valve Cover Bolt Kit

620-52104

Stainless Steel Bolt Kits - B/B Ford Steel Valve 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 number


Big/Small Block Chevy Gen 4 Thermostatically Controlled Engine Block Adapter
Your Price:
$359.99

Big/Small Block Chevy Gen 4 Thermostatically Controlled Engine Block Adapter

625-7703

Big/Small Block Chevy Gen 4 Thermostatically Controlled Engine Block Adapter

Thermostatically Controlled Engine Block Adapter Gen 4 BBC / SBC

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"

Bilge "J" Drain- Self-Bailing- Polished Finish Billet Aluminum
Your Price:
$36.99

Bilge "J" Drain- Self-Bailing- Polished Finish Billet Aluminum

125-57505

Polished Finish Billet Aluminum Self-Bailing "J" Drain

These billet aluminum self-bailing bilge drains are designed to attach to the back of the hull over the drain hole.  By incorporating a one-way rubber style flap they allow water to exit the boat while underway, yet restrict the water from entering the while stopped. Use #6 screws to mount (not included).

This drain measures 2" X 2" with a 1-1/2" center drain hole. Bolt Holes are 1.340" center to center.

Bilge Blower - 3" Inlet/Outlet
Your Price:
$32.99

Bilge Blower - 3" Inlet/Outlet

620-70303

3" Inlet/Outlet - 8" Long X 4-3/4" High 170 CFM

Reliable and efficient, these  blowers offer the highest capacities available. Specially designed five-blade, bullet-nosed impeller and cambered stator vanes provide extra high pressure with a minimum of turbulence. Housings are molded of tough, corrosion-proof plastic with rugged built-in mounting brackets for easy installation and quieter operation. UL listed. Three-year warranty.

  • 3" In-Line Blower - 170 cfm open flow.
  • 8" L x 4-3/4" H.
  • Five-blade, bullet-nosed impeller
  • Cambered stator vanes
  • Minimum of turbulence
  • Corrosion-proof plastic housings

Bilge Blower - 4" Inlet/Outlet
Your Price:
$32.99

Bilge Blower - 4" Inlet/Outlet

620-70304

4" Turbo In-Line Blower - 240 CFM

Reliable and efficient, these blowers offer the highest capacities available. Specially designed five-blade, bullet-nosed impeller and cambered stator vanes provide extra high pressure with a minimum of turbulence. Housings are molded of tough, corrosion-proof plastic with rugged built-in mounting brackets for easy installation and quieter operation. UL listed. Three-year warranty. Water-Resistant model for added protection in high-moisture applications.

  • 4" In-Line Blower - 240 cfm open flow.
  • 5-3/4" L x 4-3/4" H.
  • Five-blade, bullet-nosed impeller
  • Cambered stator
  • Minimum of turbulence
  • Corrosion-proof plastic housings

Billet 454 / 502 Serpentine Circ Pump Pulley
Your Price:
$179.99

Billet 454 / 502 Serpentine Circ Pump Pulley

421-211

  • Made from Billet Aluminium
  • FITS Hardin Pump Eliminator Crossover or Stock Mercury Pump
  • 1-3/4" Bolt Circle
  • Polished Finish
  • 4 Bolt Mount
  • Smooth Belt Running Surface
  • 6" Diameter
  • 1-1/8" Belt Surface Height
  • 1-1/2" Overall Height


Billet 454 / 502 Serpentine Circ Pump Pulley
Your Price:
$189.99

Billet 496 / 8.2L Serpentine Circ Pump Pulley

421-230

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


Billet Aluminum "ST" Control

Your Price:
$139.99

Billet Aluminum "ST" Control

125-SL-35 + Option(s)

Billet Aluminum "ST" Control

These attractive billet aluminum "ST" controls are a great upgrade from your chrome style "ST" control These controls are precision machined to be a direct replacement of standard "ST" controls and offer a modern updated appearance to any boat. Powder Coated finish.


Billet 3/4" Low Profile Steering Shaft Adapter
Your Price:
$42.99

Billet Aluminum 3/4" Low Profile Steering Shaft Adapter

620-243101

Billet Aluminum 3/4" Low Profile Steering Shaft Adapter

These 2-1/2" OD small diameter low profile steering shaft Adapters work great on any boat. They accept tall 3/4" round tapered shafts and provide a 3-bolt steering wheel mounting flange. Center line on the three bolt holes is 1-3/4"

Need help installing your new shaft adapter? Check out this handy tutorial!


Billet 3/4" Low Profile Steering Shaft Adapter
Your Price:
$55.99

Billet Aluminum 3/4" Steering Shaft Adapter

144-1110

Billet Aluminum 3/4" Steering Shaft Adapter

These 2-1/2" OD small diameter low profile steering shaft Adapters work great on any boat. They accept tall 3/4" round tapered shafts and provide a 3-bolt steering wheel mounting flange. Center line on the three bolt holes is 1-3/4", depth is 1-1/2"

Need help installing your new shaft adapter? Check out this handy tutorial!


Polished 43C Cable Seal
Starting From:
$24.99

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

Billet Aluminum 43C Cable Seal

MULTIPLE PART NUMBER OPTIONS. CLICK PART OPTIONS FOR MORE INFO ->

This is the perfect way to seal that diverter control cable.

These beautiful billet aluminum cable seals use a 1/2" NPT male thread toadapt them and a sure fit rubber compression seal for reliability. Available in Satin or Black Anodized Finish.


Stainless Steel 6-Bolt One-Piece Steering Wheel Adapter - 1.85"
Your Price:
$169.99

Billet Aluminum 6-Bolt One-Piece Steering Wheel and Shaft Adapter - 10"

137-9115

  • Polished Billet Aluminum
  • Fits 3/4" Tapered Shaft with Keyway
  • Positions Steering Wheel Mount Point approximately 10" off dash
  • 6-Bolt Momo and Dino Bolt Patterns
  • Momo bolt pattern 2-3/4" center to center across
  • Dino bolt pattern 2-7/8" center to center across
  • 3.40" Outside Diameter, 2.38" Shaft Diameter, 7.85" Overall Height

Need help installing your new adapter? Check out this handy tutorial!


Stainless Steel 6-Bolt One-Piece Steering Wheel Adapter - 1.85"
Your Price:
$209.99

Billet Aluminum 6-Bolt One-Piece Steering Wheel and Shaft Adapter - 12"

137-9116

  • Polished Billet Aluminum
  • Fits 3/4" Tapered Shaft with Keyway
  • Positions Steering Wheel Mount Point approximately 12" off dash
  • 6-Bolt Momo and Dino Bolt Patterns
  • Momo bolt pattern 2-3/4" center to center across
  • Dino bolt pattern 2-7/8" center to center across
  • 3.40" Outside Diameter, 2.38" Shaft Diameter, 9.85" Overall Height

Need help installing your new adapter? Check out this handy tutorial!


Stainless Steel 6-Bolt One-Piece Steering Wheel Adapter - 1.85"
Your Price:
$115.68

Billet Aluminum 6-Bolt One-Piece Steering Wheel and Shaft Adapter - 3.85"

137-9105

  • Polished Billet Aluminium
  • Fits 3/4" Tapered Shaft with Keyway
  • Positions Steering Wheel Mount Point approximately 6" off dash
  • 6-Bolt Momo and Dino Bolt Patterns
  • Momo bolt pattern 2-3/4" center to center across
  • Dino bolt pattern 2-7/8" center to center across
  • 3.40" Outside Diameter, 2.38" Shaft Diameter, 3.85" Overall Height

Need help installing your new adapter? Check out this handy tutorial!


Stainless Steel 6-Bolt One-Piece Steering Wheel Adapter - 1.85"
Your Price:
$149.99

Billet Aluminum 6-Bolt One-Piece Steering Wheel and Shaft Adapter - 5.85"

137-9106

  • Polished Billet Aluminum
  • Fits 3/4" Tapered Shaft with Keyway
  • Positions Steering Wheel Mount Point approximately 8" off dash
  • 6-Bolt Momo and Dino Bolt Patterns
  • Momo bolt pattern 2-3/4" center to center across
  • Dino bolt pattern 2-7/8" center to center across
  • 3.40" Outside Diameter, 2.38" Shaft Diameter, 5.85" Overall Height

Need help installing your new adapter? Check out this handy tutorial!


Billet Aluminum Accent Knob For "ST" Controls

Your Price:
$24.99

Billet Aluminum Accent Knob For "ST" Controls

125-30-K + Option(s)

Billet Aluminum Accent Knob For "ST" Controls

These precision machined billet aluminum knobs are a perfect way to accent some color into your boat. The knobs are a standard "ST" thread. Available in all popular colors.


Billet Aluminum Beveled Toggle Switch Bezel

Your Price:
$13.99

Billet Aluminum Beveled Toggle Switch Bezel

125-28-S + Option(s)

Billet Aluminum Beveled Toggle Switch Bezel

Thread size on this bezel is: 15/32 to match most of all standard toggle switches.

Here's another great way to highlight any dash. These easy to install billet switch bezels come in all popular colors to fit key switches, push-pull switches, toggle switches, and even push button switches. This bezel is similar to 125-26-S but has a tall bevel to the top rather than being flat.

See what each of our powder-coated finishes (both flat and glossy) look like under different lighting here!

Billet Aluminum Big Block Chevy Fuel Pump Block Off Plate
Your Price:
$19.99

Billet Aluminum Big Block Chevy Fuel Pump Block Off Plate

620-76257

Ball Milled Billet Aluminum Big Block Chevy Fuel Pump Block Off Plate

This heavy duty fuel pump block off can be used to block off the engine mounted mechanical fuel pump or Gen 5/6 Mercury sea pump / fuel pump pad when converting to an electric fuel pump.


Billet Aluminum Bolt On Oil Cap, Polished
Your Price:
$21.99

Billet Aluminum Bolt On Oil Cap, Polished

620-70121

Billet Aluminum Bolt On Oil Cap, Polished (Fasteners Not Included)b>

These beautiful billet caps are great for many applications. Billet aluminum oil caps are designed to be bolted-in, have a positive O-ring seal and are -16 AN thread. 1-1/4" Inside Diameter. 1-1/2" Outside Diameter. 2" O.D. Base Diameter. 1-3/4" Cap Diameter


Billet Aluminum Chevy Distributor Hold Down Clamp
Your Price:
$28.99

Billet Aluminum Chevy Distributor Hold Down Clamp

620-96460

  • Strong enough to keep the timing locked in place whether your are using an MSD billet distributor or stock distributor.
  • CNC machined from billet aluminum.
  • Fits all MSD Pro-Billet Chevrolet distributors and stock distributors.
  • Includes the mounting stud, lock washer and nut.

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 Aluminum Flywheel - Externally Balanced For Gen 4 Big Block Chevy
Your Price:
$419.99

Billet Aluminum Flywheel - Externally Balanced For Gen 4, 5 & 6 Big Block Chevy 454 CID (Bottom Mount Starter)

755-8610

Billet Aluminum Flywheel - Externally Balanced For Gen 4, 5 & 6 Big Block Chevy 454 CID

These all new Keith Eickert billet aluminum flywheels are manufactured from certified billet material that will not break up under stress and severe punishment of on and off throttle in high RPM marine environments.

By using a lighter aluminum flywheel you will be rewarded with both faster acceleration and deceleration giving you the edge you're looking for.

  • Billet construction
  • Accepts Mercury couplers and heavy duty drive plates
  • Multi-point ring gear attachment
  • Lightweight yet durable
  • Zero/neutral balance
  • 168 tooth gear
  • Weight: 12 lbs
  • Bottom Mount Starter

External Balance Alum. Flywheel Gen 4,5, & 6 B/B Chevy
Your Price:
$419.99

Billet Aluminum Flywheel - Externally Balanced For Gen 4, 5 & 6 Big Block Chevy 454 CID (Top Mount Starter)

755-8608

External Balance Alum. Flywheel Gen 4,5, & 6 B/B Chevy (Top/Bellhousing Mounted Starter)

These all new billet aluminum flywheels are manufactured from certified billet material that will not break up under the stress and severe punishment of on and off throttle in high RPM marine environments.

By using a lighter aluminum flywheel, you will be rewarded with both faster acceleration and deceleration. Giving you the edge you’re looking for.

Billet construction

  • Accepts Mercury couplers and heavy duty drive plates
  • Multi-point ring gear attachment
  • Light weight yet durable
  • Zero/neutral balance • 168 tooth gear
  • Weight: 12lbs

Billet Aluminum Flywheel - Externally Balanced For Gen 4 Big Block Chevy
Your Price:
$529.99

Billet Aluminum Flywheel - Externally Balanced For Gen 4, 5 & 6 Big Block Chevy 502 CID (Bottom Mount Starter)

755-8611

Billet Aluminum Flywheel - Externally Balanced For Gen 4, 5 & 6 Big Block Chevy 502 CID

These all new Keith Eickert billet aluminum flywheels are manufactured from certified billet material that will not break up under stress and severe punishment of on and off throttle in high RPM marine environments.

By using a lighter aluminum flywheel you will be rewarded with both faster acceleration and deceleration giving you the edge you're looking for.

  • Billet construction
  • Accepts Mercury couplers and heavy duty drive plates
  • Multi-point ring gear attachment
  • Lightweight yet durable
  • Zero/neutral balance
  • 168 tooth gear
  • Weight: 12 lbs
  • Bottom Mount Starter

External Balance Alum. Flywheel Gen 4,5, & 6 B/B Chevy
Your Price:
$529.99

Billet Aluminum Flywheel - Externally Balanced For Gen 4, 5 & 6 Big Block Chevy 502 CID (Top Mount Starter)

755-8609

External Balance Alum. Flywheel Gen 4,5, & 6 B/B Chevy 502 CID (Top/Bellhousing Mounted Starter)

These all new billet aluminum flywheels are manufactured from certified billet material that will not break up under the stress and severe punishment of on and off throttle in high RPM marine environments.

Attaching locating tabs have been installed on the ring gear making rear gear shift and movement a thing of the past. By using a lighter aluminum flywheel, you will be rewarded with both faster acceleration and deceleration. Giving you the edge you’re looking for.

Billet construction

  • Accepts Mercury couplers and heavy duty drive plates
  • Multi-point ring gear attachment
  • Light weight yet durable
  • Zero/neutral balance • 168 tooth gear
  • Weight: 12lbs