Hardin Marine

GM LS1 - LS3 Thermostatic Control Crossover Cooling System for Non-Circulating Pump Applications

AT last a cooling system solution for adapting the popular GM LS engine into any Jet Boat or application with an external water pump source. This system allows removal of the Automotive engine mounted water circulation pump and provides both water inlet/outlet and temperature control through the integrated thermostat assembly. Clean, simple, and reliable the perfect solution for retrofitting the LS modern engine into a jet boat or any boat not utilizing the OEM circulating pump.

WARNING**** will not work with Variable Valve Timing covers.

GM LS1 - LS3 Thermostatic Cooling System for Freshwater Sterndrive Applications

As Hardin Marine continues the quest towards new product development they have designed an easy to install thermostatic cooling system for freshwater raw water cooled engine applications. This system allows use of an OEM circulating style water pump and multiple accessory drive kits to to be used while providing the necessary thermostat assembly for temperature control. This is perfect for retrofitting a GM LS based engine into most popular sterndrive engine applications using a sea water pump assembly. Precision CNC machined and anodized satin finish make for an attractive compact fitment. Each unit features a 160 degree thermostat while other heat range thermostats and a bypass hose assembly is sold separately.

These are the same coolers OEM Engine manufactures use on their LSA Marine engine conversions. The OEM manufacturer builds their own bracketry and it IS NOT available. So if you plan on buying these units each has a mounting bolt pad but you will need to build YOUR OWN bracketry. If you do not understand closed cooling seek a professional engine builder. There is NOT additional specs available what you see is what we sell we have attached plumbing instructions and some diagrams to assist. They are sold as tanks ONLY for both the engine and the intercooler. Seek a knowledgeable professional for installation.

GM Saginaw Power Steering Banjo Fitting, 5/8-18 Thread X -6AN

This custom banjo fitting allows you to clear exhaust system and enginebracket. This banjo can swivel 360-degrees for easy plumbing.

GOLD Powdercoat Billet Aluminum Switch Knobs - Limited Styles and Quantity

These billet aluminum switch knobs are perfect for accenting and tying in the color of your boat if you happen to like gold. They simply thread on to all 10-32 standard switches. These are available in limited quantities and styles. 

Grab Handle Bezels Fits 950-47816X Handles

These powder coated bezels will fit the 950-47816X Grab Handles. 1.630" OD, 1.250" ID Register, 0.500" Center Bolt Hole

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

Group 31 Billet Battery Box

Our selection of highly polished, satin or Powdercoated aluminum battery boxes offer great looks and battery security all in one. This battery box fits group 31 batteries. Each box assembles with stainless steel hardware.

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

Hardin / Gil HP Air Sound Select Polished Tailpipe Conversion Kit - Standard Bravo Dimensions

This all new air sound select pipe is based on the popular wet offshore system.  By incorporating the popular sound select into the 1-piece tailpipe system while using air activation, you now have the best of both worlds in a beautifully styled riser package.  These tailpipes are only sold as a complete kit with air pump, hose, and fittings to make for a simple installation.  All hardware is included.  Sold in pairs. Built to Order with 4-6 week build time.

Additional Information:

• Standard Alpha/Bravo Exhaust Hole Locations
• Custom Measurement Instructions

Gil / Hardin Replacement Lid Assembly, 3/8" Stud

This is a 3/8" hole replacement Complete Sea Strainer Lid Assembly. This clear-view lid allows unrestricted visual inspection. Designed to fit Gil Generation 2 (Single Knob) and Hardin Offshore Generation 1 Sea Strainers.

O- ring for the lid is included

Hardin BBC Pyramid 2-Piece Valve Cover Accessories - Large O-Ring (for replacement between valve covers)

These are replacement O-Rings for the Hardin Marine Pyramid 2 Piece Valve Covers. Sold Each.

Hardin Drop Style Mounting Feet (sold in pairs)

These are replacement mount feet for Hardin and Glenwood mounts. Glenwood has a smooth back and Hardin has a raised half moon on back. There is a 4" drop from the top of the mount to the middle groove on the mount.

Hardin Dual Stage Gen. 1 Sea Pump Master Rebuild Kit

Replace all the bearings, seals, o-rings, clips, wear plates and impellers on your Hardin Dual Stage Sea Pump.

Gen. 1 Pumps have Black, Hardcoated, Billet Aluminum Rear Covers.
Gen. 2 Pumps have Polished, Cast Stainless Steel Rear Covers with a bolt in the center. The name Hardin Marine is cast into the cover.

Hardin Dual Stage Gen. 2 Sea Pump Master Rebuild Kit

Replace all the bearings, seals, o-rings, clips, wear plates and impellers on your Hardin Dual Stage Sea Pump.

Gen. 1 Pumps have Black, Hardcoated, Billet Aluminum Rear Covers.
Gen. 2 Pumps have Polished, Cast Stainless Steel Rear Covers with a bolt in the center. The name Hardin Marine is cast into the cover.

Gil /Hardin Electrical/Shift Cable Bracket for Mercury (Fits Both)

These brackets are the same units included in our popular Gil Exhaust Kits and provide easy installation of our factory accessories. Bolt center to center is 4-1/4"

Hardin Gen 2 Offshore Sea Strainer Replacement Lid Assembly, 1/2" Stud

This is a 1/2" hole replacement Complete Sea Strainer Lid Assembly. This clear-view lid allows unrestricted visual inspection. Designed to fit Hardin Offshore Generation 2 Sea Strainers with 1/2" studs.

Master Rebuild Service Kit - For Gen. 4 Hardin Stainless Pumps with Plastic Rear Body - Mercury Replacement

This master kit is a rebuild service kit for the Hardin Marine stainless pump 625-4111. This kit comes with new wear plates , O-rings, seals, impeller, rear housing and retaining clip.

Master Rebuild Service Kit - For Gen. 5/6 Hardin Stainless Pumps - Mercury Replacement

This master kit is a rebuild service kit for the Hardin Marine stainless pump 625-4118. This kit comes with new wear plates , O-rings, seals, impeller and retaining clip.

Master Rebuild Service Kit - For Gen. 5/6 Hardin Stainless Pumps with Plastic Rear Body - Mercury Replacement

This master kit is a rebuild service kit for the Hardin Marine stainless pump 625-4118. This kit comes with new wear plates , O-rings, seals, impeller, rear housing and retaining clip.