Oil Systems - Thermostatic Oil Control

Polished Horizontally Mounted ​ Thermostatically Controlled Engine ​ Oil Filter Mount
Your Price:
$629.99

Polished Horizontally Mounted ​Thermostatically Controlled Engine​ Oil Filter Mount

625-7701

Polished Horizontally Mounted Thermostatically Controlled Engine Oil Filter 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.

With this unit all oil temperature is now controlled through a integral 212 degree oil thermostat. The large -12 O-Ring style port fitting oil inlets/outlets assure the maximum amount of oil can be flowed through the unit. Accepts either: FRAM *HP4 / HP6 style Oil Filter *


Black Horizontally Mounted ​ Thermostatically Controlled Engine ​ Oil Filter Mount
Your Price:
$639.99

Black Horizontally Mounted ​ Thermostatically Controlled Engine ​ Oil Filter Mount

625-7702

Black Horizontally Mounted Thermostatically Controlled Engine Oil Filter 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.


Vertical Mount Thermostat Filter Head - Polished
Your Price:
$639.99

Vertical Mount Thermostat Filter Head - Polished

625-7711

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.


Vertical Mount Thermostat Filter Head - Black
Your Price:
$639.99

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

Vertical Mount Thermostat Filter Head - Black

625-7712

Vertical Mount Thermostat Filter Head - Black

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.


Polished Remote Bulkhead Mount ​Thermostatically Controlled Engine​ Oil Filter Mount
Your Price:
$639.99

Polished Remote Bulkhead Mount Thermostatically Controlled Engine Oil Filter Mount

625-7713

Polished Remote Bulkhead Mount Thermostatically Controlled Engine Oil Filter Mount

  • Remote Mount
  • Thermostatically Controlled Engine
  • Oil Filter 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.

With this unit all oil temperature is now controlled through a integral 212 degree oil thermostat. The large -12 O-Ring style port fitting oil inlets/outlets assure the maximum amount of oil can be flowed through the unit. Accepts either FRAM *HP4 / HP6 style Oil Filter *


Black Remote Bulkhead Mount ​Thermostatically Controlled Engine​ Oil Filter Mount
Your Price:
$639.99

Black Remote Bulkhead Mount ​Thermostatically Controlled Engine​ Oil Filter Mount

625-7714

Black Remote Bulkhead Mount Thermostatically Controlled Engine Oil Filter Mount

  • Remote Mount
  • Thermostatically Controlled Engine
  • Oil Filter 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.

With this unit all oil temperature is now controlled through a integral 212 degree oil thermostat. The large -12 O-Ring style port fitting oil inlets/outlets assure the maximum amount of oil can be flowed through the unit. Accepts either FRAM *HP4 / HP6 style Oil Filter *


Big/Small Block Chevy Gen 4 Thermostatically Controlled Engine Block Adapter
Your Price:
$299.99

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"

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"



GM LS Series Remote Side Mount Thermostat Oil Filter Adapter
Your Price:
$269.95

GM LS Series Remote Side Mount Thermostat Oil Filter Adapter

625-4526

GM LS Series Remote Side Mount Oil Filter Adapter

Earl's billet side mount oil cooler adapters are the slick way to add an oil cooler to your GM LS or Gen-V LT engine. The slim design of these adapters clear most headers and other components and feature -10 AN male connections. These adapters are black anodized and use O-Ring seals for a leak free installation. Fits OEM & Holley Wet Sump oil pans only (Does not Fit Dry Sump Engines).

  • Billet Aluminum w/ Black Anodized Finish
  • Includes 0-Ring Seal & Hardware
  • (2) 1/8” NPT Accessory Ports
  • -10 AN Male Connections
  • Available w/ 180 Degree Thermostat
  • Add an Earl’s Oil Cooler and AN Plumbing to Complete the Installation

Tube Style Engine Oil Control Kit Up To 700HP

Your Price:
$1,115.99

Tube Style Engine Oil Control Kit Up To 700HP, Gen 5/6 BBC, Thermostatic

620-800 + Option(s)

  • For Gen 5/6 BBC Applications.
  • 3" x 16" Oil Cooler with choice of Polished or Black Anodized Brackets.
  • 8' of Push-Loc Hose included.
  • Includes 625-7704 Thermostatically Controlled Engine Block Adapter.
  • Includes 4 Straight and 4 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP

Your Price:
$1,559.99

Tube Style Engine Oil Filter and Control Kit Up To 700HP, Gen 5/6 BBC, Thermostatic

620-801 + Option(s)

  • For Gen 5/6 BBC Applications.
  • 3" x 16" Oil Cooler with choice of Polished or Black Anodized Brackets.
  • 10' of Push-Loc Hose included.
  • Includes 625-7704 Thermostatically Controlled Engine Block Adapter.
  • Includes 625-7742/5 Oil Filter Head in choice of polished or black anodized.
  • Includes 8 Straight and 8 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP
Your Price:
$1,314.77

Tube Style Engine Oil Control Kit Up To 700HP, Gen 5/6 BBC, Thermostatic - Bravo Bellhousing Mount

620-802

  • For Gen 5/6 BBC Applications.
  • Bravo Bellhousing mounted.
  • 3" x 25" Oil tube Cooler with black anodized Brackets.
  • 8' of Push-Loc Hose included.
  • Includes 625-7704 Thermostatically Controlled Engine Block Adapter.
  • Includes 4 Straight and 4 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP

Your Price:
$1,599.99

Tube Style Engine Oil Filter and Control Kit Up To 700HP, Gen 5/6 BBC, Thermostatic - Bravo Bellhousing Mount

620-803 + Option(s)

  • For Gen 5/6 BBC Applications.
  • Bravo Bellhousing mounted.
  • 3" x 16" Oil tube Cooler with black anodized Brackets.
  • 8' of Push-Loc Hose included.
  • Includes 625-7704 Thermostatically Controlled Engine Block Adapter.
  • Includes 625-7742/5 Oil Filter Head with Choice of Polished or black anodized
  • Includes 4 Straight and 4 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP

Your Price:
$1,129.99

Tube Style Engine Oil Control Kit Up To 700HP, Gen 4 BBC, Thermostatic

620-804 + Option(s)

  • For Gen 4 BBC Applications.
  • 3" x 16" Oil Cooler with choice of Polished or Black anodized Brackets.
  • 8' of Push-Loc Hose included.
  • Includes 625-7704 Thermostatically Controlled Engine Block Adapter.
  • Includes 4 Straight and 4 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP
Your Price:
$1,169.99

Tube Style Engine Oil Control Kit Up To 700HP, Gen 4 BBC, Thermostatic - Bravo Bellhousing Mount

620-806

  • For Gen 4 BBC Applications.
  • Bravo Bellhousing mounted.
  • 3" x 16" Oil Cooler with black anodized Brackets.
  • 8' of Push-Loc Hose included.
  • Includes 625-7703 Thermostatically Controlled Engine Block Adapter.
  • Includes 4 Straight and 4 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP
Your Price:
$999.99

Tube Style Engine Oil Control Kit Up To 700HP, Gen 4 BBC, Non-Thermostatic - Bravo Bellhousing Mount

620-807

  • For Gen 4 BBC Applications.
  • Bravo Bellhousing mounted.
  • 3" x 16" Oil Cooler with black anodized Brackets.
  • 8' of Push-Loc Hose included.
  • Includes 625-7914 Engine Block Adapter.
  • Includes 4 Straight and 4 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP

Your Price:
$1,619.99

Tube Style Engine Oil Filter and Control Kit Up To 700HP, Gen 4 BBC, Thermostatic - Bravo Bellhousing Mount

620-808 + Option(s)

  • For Gen 4 BBC Applications.
  • Bravo Bellhousing mounted.
  • 3" x 16" Oil tube Cooler with black anodized Brackets.
  • 10' of Push-Loc Hose included.
  • Includes 625-7703 Thermostatically Controlled Engine Block Adapter.
  • Includes 625-7742/5 Oil Filter Head with Choice of Polished or black anodized
  • Includes 8 Straight and 8 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP

Your Price:
$1,359.99

Tube Style Engine Oil Filter and Control Kit Up To 700HP, Gen 4 BBC, Non-Thermostatic - Bravo Bellhousing Mount

620-809 + Option(s)

  • For Gen 4 BBC Applications.
  • Bravo Bellhousing mounted.
  • 3" x 16" Oil tube Cooler with black anodized Brackets.
  • 10' of Push-Loc Hose included.
  • Includes 625-7914 Engine Block Adapter.
  • Includes 625-7742/5 Oil Filter Head with Choice of Polished or black anodized
  • Includes 6 Straight and 6 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP

Your Price:
$1,339.99

Tube Style Engine Oil Filter and Control Kit Up To 700HP, Gen 5/6 BBC, Non-Thermostatic

620-811 + Option(s)

  • For Gen 5/6 BBC Applications.
  • 3" x 16" Oil Cooler with choice of Polished or Black Anodized Brackets.
  • 10' of Push-Loc Hose included.
  • Includes 625-7916 Thermostatically Controlled Engine Block Adapter.
  • Includes 625-7742/5 Oil Filter Head in choice of polished or black anodized.
  • Includes 6 Straight and 6 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).

Tube Style Engine Oil Control Kit Up To 700HP
Your Price:
$1,010.99

Tube Style Engine Oil Control Kit Up To 700HP, Gen 5/6 BBC, Non-Thermostatic - Bravo Bellhousing Mount

620-812

  • For Gen 5/6 BBC Applications.
  • Bravo Bellhousing mounted.
  • 3" x 16" Oil Cooler with black anodized Brackets.
  • 8' of Push-Loc Hose included.
  • Includes 625-7916 Engine Block Adapter.
  • Includes 4 Straight and 4 90 Degree Fittings for installation.
  • Includes XRP Push-on Ensure Clamps that are self tensioning for severe race and high temp applications. A must for high heat and oil line applications like this, ensuring a secure seal without damage to the hose construction. For installation and removal of hose clamps, specially designed pliers are available (see related parts).