Hardin Marine

Vertical Mount Thermostat Filter Head - Polished, Big Block Chevy Cylinder Head Mount

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 flow 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. Does not include fittings.

2" Volt Gauge - White, Black or Stainless

• Operating range of 10 to 16 volts Bold,
• Clear dials, white light bulb, and a red needle
• Non-corrosive hardware Gasket sealed lens and bezel to prevent fogging
• Plastic body
• Domelux Technology Lens
• 2 1/16 hole size, Outer diameter 2 5/16
• Not Designed to be used with Diesel Engines.
• NOTE: This older style gauge matches 2018 and earlier model Hardin Gauges

Need help measuring your gauges so you know what to look for when you finally upgrade to a more polished set? Check out this handy tutorial!

Water Inlet Crossover Kit for GM LS Engines

These new adapters and crossover tubes allow easy installation of a remote mounted electric water pump on the GM LS engine. These billet aluminum block adapters feature (4) -12 AN O-ring female ports for routing water to a remote mounted electric water pump. The 1/8" NPT Port can be used to connect to the steam tube plumbing.

• Constructed of 316L Stainless Steel.
• -10 AN Divider with 3/8" NPT Bypass
• Fits 8-71 thru 14-71 TBS and B&M 250 and 420 superchargers.
• Specially designed for V8 Chevrolet engine applications using superchargers.
• Includes bolts, and gaskets.

• Constructed of 316L Stainless Steel.
• -12 AN Divider with 3/8" NPT Bypass.
• Fits 8-71 thru 14-71 TBS and B&M 250 and 420.
• Specially designed for V8 Chevrolet engine applications using superchargers.
• Includes bolts, and gaskets.

Water Outlet Hose for LS1 - LS3 Thermostatic Cooling System

Adjustable  Water Pressure Relief Valve 1/2" NPT

This spring loaded adjustable water pressure relief valve is perfect for bleeding off excess engine water pressure caused by pressure spikes in an engines cooling system.  water flows freely when water pressure exceeds the set designated pressure.  Keep high pressure spikes from damaging your engine.

Adjustable from 7-25 PSI. Flow rate: 1.5 GPM at 10 PSI, 5 GPM at 25 PSI. 

Adjustable  Water Pressure Relief Valve 3/4" NPT Male Port, 1/2" NPT Female Port

This spring loaded adjustable water pressure relief valve is perfect for bleeding off excess engine water pressure caused by pressure spikes in an engines cooling system.  water flows freely when water pressure exceeds the set designated pressure.  Keep high pressure spikes from damaging your engine.

Adjustable from 7-25 PSI. Flow rate: 1.5 GPM at 10 PSI, 5 GPM at 25 PSI. 

Marine Seal™ Water Pump Cover Gasket - Ford 429/460- Sold Each

These Hardin Marine Seal timing cover/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

Wear Plate for Hardin Marine Multi Stage Sea Pumps

Wear Plate with Hole for Hardin Marine Multi Stage Sea Pumps

Wear Plate, No Slot

• Made from 316L Stainless Steel
• (2x) -12 AN Female x -12 AN Male
• For Whipple Interrcoolers
• WILL NOT FIT WITH MERCURY 525 HEAT EXCHANGER!

• Made from 316L Stainless Steel
• (2x) -12 AN Female x -16 AN Male
• For Whipple Interrcoolers

• Made from 316L Stainless Steel
• (2x) -12 AN Female x -16 AN Male
• For Whipple Logs

White Fixed Deck Cleat

• Available: (1) One
• 4" x 3/4"

"XS" Xtreme Black Single Plane Big Block Chevy Rectangular Port Intake Manifold

This design is very efficient and produces excellent power in the RPM range most often used in performance boating. This intake is patterned after the most respected intake in the marine industry the HP500 carbureted intake manifold. With quite possibly more victories than any single other intake on the market, you know you're on the winning track. This intake features one of the fasted torque curves anywhere and all power boaters know torque is what makes the difference. If you're looking for the most for you money you'll demand the Hardin "XS" Xtreme Intake.

At last you can buy an intake manifold specifically designed to meet the unique needs a performance boat demands from a company that knows what performance is. Hardin Marine has been building manifolds for over 40years. At last you the performance boater can take advantage of the state of the art technology in each of these new manifolds. Here are just a few of the state of the art features that keep Hardin Marine Intakes leading the race.

Dual Distributor Hold Downs
Sometimes the standard single distributor hold down is not enough. so we have provided dual distributor hold downs on all Hardin Marine intake manifolds.

Four Corner Water Ports
All Hardin Marine performance manifolds feature two extra water ports at the rear of the manifold, a feature normally only found in manifolds costing hundreds more. Some enthusiasts have found that plumbing a line between these two rear ports can reduce engine overheating. Many racers also find these ports to be an advantageous special feature for plumbing special additional water lines.

Other Special Features

• All ports are very accurately positioned due to advanced casting techniques.
• Black painted finish.
• Just before packing, every tapped hole in each manifold is chased with a tap to clear out polishing residue and to assure the threads are not damaged.

"XS" Xtreme Machine Polished Single Plane Big Block Chevy Rectangular Port Intake Manifold

This design is very efficient and produces excellent power in the RPM range most often used in performance boating. This intake is patterned after the most respected intake in the marine industry the HP500 carbureted intake manifold. With quite possibly more victories than any single other intake on the market, you know you're on the winning track. This intake features one of the fasted torque curves anywhere and all power boaters know torque is what makes the difference. If you're looking for the most for you money you'll demand the Hardin "XS" Xtreme Intake.

At last you can buy an intake manifold specifically designed to meet the unique needs a performance boat demands from a company that knows what performance is. Hardin Marine has been building manifolds for over 40years. At last you the performance boater can take advantage of the state of the art technology in each of these new manifolds. Here are just a few of the state of the art features that keep Hardin Marine Intakes leading the race.

Dual Distributor Hold Downs
Sometimes the standard single distributor hold down is not enough. so wehave provided dual distributor hold downs on all Hardin Marine intake manifolds.

Four Corner Water Ports
All Hardin Marine performance manifolds feature two extra water ports at the rear of the manifold, a feature normally only found in manifolds costing hundreds more. Some enthusiasts have found that plumbing a line between these two rear ports can reduce engine overheating. Many racers also find these ports to be an advantageous special feature for plumbing special additional water lines.

Other Special Features

• All ports are very accurately positioned due to advanced casting techniques.
• All machined polished manifolds are rough polished to a remove some major casting marks but are NOT an mirror polish type finish (see photos).
• Just before packing, every tapped hole in each manifold is chased with a tap to clear out polishing residue and to assure the threads are not damaged.

"XS" Xtreme Satin Finish Single Plane Big Block Chevy Rectangular Port Intake Manifold

This design is very efficient and produces excellent power in the RPM rangemost often used in performance boating. This intake is patterned after themost respected intake in the marine industry the HP500 carbureted intakemanifold. With quite possibly more victories than any single other intakeon the market, you know you're on the winning track. This intake featuresone of the fasted torque curves anywhere and all power boaters know torque iswhat makes the difference. If you're looking for the most for you moneyyou'll demand the Hardin "XS" Xtreme Intake.

At last you can buy an intake manifold specifically designed to meet theunique needs a performance boat demands from a company that knows whatperformance is. Hardin Marine has been building manifolds for over 40years. At last you the performance boater can take advantage of the stateof the art technology in each of these new manifolds. Here are just a fewof the state of the art features that keep Hardin Marine Intakes leading therace.

DualDistributor Hold Downs
Sometimes the standard single distributor hold down is not enough. so wehave provided dual distributor hold downs on all Hardin Marine intake manifolds.

FourCorner Water Ports
All Hardin Marine performance manifolds feature two extra water ports at therear of the manifold, a feature normally only found in manifolds costinghundreds more. Some enthusiasts have found that plumbing a line betweenthese two rear ports can reduce engine overheating. Many racers also findthese ports to be an advantageous special feature for plumbing specialadditional water lines.

Other Special Features

• All ports are very accurately positioned due to advanced casting techniques.
• All polished manifolds are meticulously hand polished to a show level finish.
• Just before packing, every tapped hole in each manifold is chased with a tap to clear out polishing residue and to assure the threads are not damaged.

"XS" Xtreme Series 10 Quart Pan Oil Pick-up - Big Block Chevy Gen 4, 5 & 6

High performance oil pickups to fit most popular applications.

"XS" Xtreme Series 14 Quart Pan Oil Pick-up - Big Block Chevy Gen 4, 5 & 6

High performance oil pickups to fit most popular applications.