Cooling Systems - Thermostats

140 Degree Brass Hi-flow Marine Thermostat
Your Price:
$39.99

120 Degree Brass Hi-flow Marine Thermostat

540-160110

120 Degree Brass Hi-flow Marine Thermostat

These hi-flow brass marine thermostats feature air relief ports. This enables relief of the steam pockets caused by cold water entering a heated engine block. Their hi-flow design helps to maintain a constant operating temperature. Don't trust your engine to anything less!


120 Degree Brass Hi-Flow Marine Thermostat - For 496/525 Engines
Your Price:
$69.99

120 Degree Brass Hi-Flow Marine Thermostat - For 496/525 Engines

540-160112

120 Degree Brass Hi-Flow Marine Thermostat - For 496/525 Engines

These Hi-Flow brass marine thermostats feature air relief parts. This enables steam pockets caused by cold water entering a heated engine block. Their hi-flow design help to maintain the most constant temperature. Don’t trust your engine to anything less.


140 Degree Brass Hi-flow Marine Thermostat
Your Price:
$39.99

140 Degree Brass Hi-flow Marine Thermostat

540-160106

140 Degree Brass Hi-flow Marine Thermostat

These hi-flow brass marine thermostats feature air relief ports. This enables relief of the steam pockets caused by cold water entering a heated engine block. Their hi-flow design helps to maintain a constant operating temperature. Don't trust your engine to anything less!


160 Degree Brass Hi-flow Marine Thermostat
Your Price:
$29.99

160 Degree Brass Hi-flow Marine Thermostat

540-160101

160 Degree Brass Hi-flow Marine Thermostat

These hi-flow brass marine thermostats feature air relief ports. Thisenables relief of the steam pockets caused by cold water entering a heatedengine block. Their hi-flow design helps to maintain a constant operatingtemperature. Don't trust your engine to anything less!


180 Degree Brass Hi-flow Marine Thermostat
Your Price:
$24.99

180 Degree Brass Hi-flow Marine Thermostat

540-160108

180 Degree Brass Hi-flow Marine Thermostat

These hi-flow brass marine thermostats feature air relief ports. Thisenables relief of the steam pockets caused by cold water entering a heatedengine block. Their hi-flow design helps to maintain a constant operatingtemperature. Don't trust your engine to anything less!


Polished Stainless Thermostat Kit For Chevy
Your Price:
$139.99

Polished Stainless Thermostat Kit For Chevy

540-160200

  • Fits most BBC, SBC applications
  • Made from Polished 316L Stainless Steel!
  • Designed for use on cold water source cooling systems.
  • Keeps engine temperature between 140 & 160 degrees.
  • Not recommended for supercharged or turbocharged engines, or sandy conditions.
  • Includes thermostat housing, 2 Tee fittings, a 160 degree thermostat, valve, seat, & spring.
  • Housing is 4 inches long x 3-1/8" wide x 3" tall.
  • Housing has four 1/2" NPT ports.
  • Tee fittings are 1/2" NPT x Two 5/8" hose on the run.
  • Includes bolts and gaskets.

Polished Stainless Thermostat Kit For 455 Olds
Your Price:
$139.99

Polished Stainless Thermostat Kit For 455 Olds

540-160210

  • Fits 455 Olds applications
  • Made from Polished 316L Stainless Steel!
  • Designed for use on cold water source cooling systems.
  • Keeps engine temperature between 140 & 160 degrees.
  • Not recommended for supercharged or turbocharged engines, or sandy conditions.
  • Includes thermostat housing, 2 Tee fittings, a 160 degree thermostat, valve, seat, & spring.
  • Housing is 4 inches long x 3-1/8" wide x 3" tall.
  • Housing has four 1/2" NPT ports.
  • Tee fittings are 1/2" NPT x Two 5/8" hose on the run.
  • Includes bolts and gaskets.

Polished Stainless Ford 429, 460 Thermostat Kit
Your Price:
$169.99

Polished Stainless Ford 429, 460 Thermostat Kit

540-160465

  • Fits Ford 429/460.
  • Made from Polished 316L Stainless Steel!
  • Designed for use on cold water source cooling systems.
  • Keeps engine temperature between 140 & 160 degrees.
  • Not recommended for supercharged or turbocharged engines, or sandy conditions.
  • Includes thermostat housing, 2 Tee fittings, a 160 degree thermostat, valve, seat, & spring.
  • Housing is 4 inches long x 3-1/8" wide x 3" tall.
  • Housing has four 1/2" NPT ports.
  • Tee fittings are 1/2" NPT x Two 5/8" hose on the run.
  • Includes bolts and gaskets.

Water Outlet Restrictor Kit
Your Price:
$10.99

Water Outlet Restrictor Kit

740-63440

Limiting the amount of coolant flow leaving the engine lets you control the amount of heat absorbed by the coolant itself. You can adjust the flow with one of these water outlet restrictor kits. They include include three round aluminum plates with 5/8 in., 3/4 in., and 1 in. I.D. holes. Simply mount the appropriate plate under the water outlet on the intake manifold. An easy and economical temperature control solution!


Thermostat
Your Price:
$13.99

Thermostat

676-18-3552

Additional Details:

  • Temperature Rating: 160°F
  • For: Fresh Water Cooling
  • Fits: 470/485 models (s/n 6218036 and below)

Use With:

Interchanges/Replaces

Crusader

  • 96358

GLM

  • 13050

Mallory

  • 9-43000

Mercruiser Stern Drive

  • 76270
  • 76270T

Thermostat
Your Price:
$14.99

Thermostat

676-18-3555

Additional Details:

  • Temperature Rating: 160°F
  • Fits: 1998 & newer GM V-6 & V-8 engines with closed cooling

Use With:

Interchanges/Replaces

GLM

  • 13040

Mallory

  • 9-43001
  • 9-43016

Mercruiser Stern Drive

  • 991551
  • 99155A1
  • 99155T2

Thermostat
Your Price:
$20.99

Thermostat

676-18-3649

Additional Details:

  • Temperature Rating: 160°
  • For: Fresh Water Cooling
  • Fits: 1987 & newer GM engines with standard cooling requiring a 160° thermostat

Use With:

Interchanges/Replaces

Crusader

  • 97895

GLM

  • 13100

Mallory

  • 9-43002

Mercruiser Stern Drive

  • 8052732
  • 8072522
  • 807252T2
  • 8M0091470
  • 8M0109441

Thermostat
Your Price:
$18.99

Thermostat

676-18-3550

Additional Details:

  • Temperature Rating: 140°F
  • Fits: MerCruiser 120/2.5L (s/n 2324347 & Up) w/cast iron exhaust manifolds
  • Fits: Mercruiser 140-3.0L (s/n 0L340999 & below) and 165

Use With:

Interchanges/Replaces

Chrysler/Force/US Marine

  • F84068
  • F84068-1
  • F84068-2
  • F85068-2

GLM

  • 13020

Mallory

  • 9-43020

Mercruiser Stern Drive

  • 59078
  • 59078A1
  • 59078B

Thermostat
Your Price:
$16.99

Thermostat

676-18-3554

Additional Details:

  • Temperature Rating: 160°

Use With:

Interchanges/Replaces

GLM

  • 13060

Mallory

  • 9-43021

OMC Inboard

  • 383307

OMC Stern Drive

  • 379754
  • 383307
  • 3852216
  • 3856961

Volvo Penta

  • 3856961

Thermostat
Your Price:
$19.99

Thermostat

676-18-3557

Additional Details:

  • Temperature Rating: 143°F (62° C)
  • Fits: MCM GM in-line 6 cyl.

Use With:

Interchanges/Replaces

Chrysler/Force/US Marine

  • F335068

GLM

  • 13080

Johnson/Evinrude Outboard

  • 382385
  • 396987

Mallory

  • 9-43024

Mercruiser Stern Drive

  • 47594

Volvo Penta

  • 21148403

Thermostat Kit
Your Price:
$21.99

Thermostat Kit

676-18-3676

Key Features:

  • For: 7.4L (1994-98), 8.2L (1998)

Additional Details:

  • Temperature Rating: 140° (60 C)
  • Thermostat: 0986506, 3853983

Interchanges/Replaces

Mallory

  • 9-43026

OMC Stern Drive

  • 3853983 + 312797 + 307239

Volvo Penta

  • 3853983 + 3852071 + 835417

List of Containing Parts

Sierra Item # OE/Competitor # Quantity Description Image Comments
18-7170Chrysler/Force/US Marine
  • 25-33504
GLM
  • 82200
Johnson/Evinrude Outboard
  • 307239
Mallory
  • 9-76502
Mercruiser Stern Drive
  • 25-33504
Mercury Marine
  • 25-33504
OMC Stern Drive
  • 307239
  • 3852071
Volvo Penta
  • 3852071
1O-Ring N/A
18-0398GLM
  • 35060
Mallory
  • 9-60009
Mercruiser Stern Drive
  • 27-33918
  • 27-8M2021920
OMC Stern Drive
  • 312797
  • 3852111
Volvo Penta
  • 3852111
  • 835417
  • 856347
1Thermostat Gasket N/A
NSSVolvo Penta
  • 3853983
1ThermostatNo ImageN/A

Thermostat Kit
Your Price:
$20.99

Thermostat Kit

676-18-3677

Additional Details:

  • Temperature Rating: 160°F (71°C)

Interchanges/Replaces

Mallory

  • 9-43028

Volvo Penta

  • 3856961 + 835417 + 3852071

List of Containing Parts

Sierra Item # OE/Competitor # Quantity Description Image Comments
18-7170Chrysler/Force/US Marine
  • 25-33504
GLM
  • 82200
Johnson/Evinrude Outboard
  • 307239
Mallory
  • 9-76502
Mercruiser Stern Drive
  • 25-33504
Mercury Marine
  • 25-33504
OMC Stern Drive
  • 307239
  • 3852071
Volvo Penta
  • 3852071
1O-Ring N/A
18-0398GLM
  • 35060
Mallory
  • 9-60009
Mercruiser Stern Drive
  • 27-33918
  • 27-8M2021920
OMC Stern Drive
  • 312797
  • 3852111
Volvo Penta
  • 3852111
  • 835417
  • 856347
1Thermostat Gasket N/A
18-3554GLM
  • 13060
Mallory
  • 9-43021
OMC Inboard
  • 383307
OMC Stern Drive
  • 379754
  • 383307
  • 3852216
  • 3856961
Volvo Penta
  • 3856961
1Thermostat N/A

Thermostat Kit
Your Price:
$15.99

Thermostat Kit

676-18-3668

Additional Details:

  • Temperature Rating: 142°F
  • Fits: 1983 & newer GM V-6 & V-8 engines with standard cooling

Interchanges/Replaces

GLM

  • 13390

Mallory

  • 9-43150

Mercruiser Stern Drive

  • 807252Q4
  • 807252T4
  • 807252T7

List of Containing Parts

Sierra Item # OE/Competitor # Quantity Description Image Comments
18-2552GLM
  • 31670
Mallory
  • 9-60008
Mercruiser Stern Drive
  • 27-331791
  • 27-331792
  • 27-33179B2
1Thermostat Cover Gasket N/A
18-2553GLM
  • 31460
Mallory
  • 9-60005
Mercruiser Stern Drive
  • 27-47510
  • 27-47510Q
Osco
  • 47510
1Thermostat Cover Gasket N/A
18-2554GLM
  • 31630
Mallory
  • 9-60006
Mercruiser Stern Drive
  • 27-41812
  • 27-41812B
  • 27-41812Q
  • 27-90556
Osco
  • 41812
1Thermostat Cover Gasket N/A
18-2917GLM
  • 31560
GM
  • 3701777
Mallory
  • 9-60007
  • 9-60007-10
Mercruiser Stern Drive
  • 27-33179
  • 27-53045
  • 27-530451
  • 27-53045B1
  • F10077105
  • FI1101276
  • FI1101291
  • FI5000096
OMC Inboard
  • 3701777
OMC Stern Drive
  • 3701777
1Thermostat Gasket N/A
18-3551Chrysler Inboard
  • 4142885
Crusader
  • 96319
GLM
  • 13030
Mallory
  • 9-43013
Mercruiser Stern Drive
  • 32728
  • 35884
  • 59137
  • 59137A1
  • 67464
  • 8052731
  • 8072521
  • 807252T1
  • 8M0089715
Osco
  • 143-DEG
Pleasurecraft
  • RO26002E
1Thermostat N/A
18-7173Chrysler/Force/US Marine
  • 25-30224
GLM
  • 82250
Johnson/Evinrude Outboard
  • 310327
Mallory
  • 9-76501
Mercruiser Stern Drive
  • 25-30224
  • 25-30224Q
Mercury Marine
  • 25-27018
  • 25-30224
  • 25-30224Q
OMC Stern Drive
  • 310327
1O-Ring N/A

Thermostat Kit
Your Price:
$21.99

Thermostat Kit

676-18-3646

Key Features:

  • 140°F

Additional Details:

  • Fits: 1982 & older Ford & GM V-8 engines w/standard cooling & 1996 & older hi-performance models
  • Fits: engines with closed cooling

Interchanges/Replaces

GLM

  • 13380

Mallory

  • 9-43151

Mercruiser Stern Drive

  • 807252Q3
  • 807252T6

List of Containing Parts

Sierra Item # OE/Competitor # Quantity Description Image Comments
18-2553GLM
  • 31460
Mallory
  • 9-60005
Mercruiser Stern Drive
  • 27-47510
  • 27-47510Q
Osco
  • 47510
1Thermostat Cover Gasket N/A
18-2834Barr
  • MC472760208
GLM
  • 31620
Mallory
  • 9-60011
Mercruiser Stern Drive
  • 27-60208
1Thermostat Cover Gasket N/A
18-2844Barr
  • MC472748818
GLM
  • 31510
Mallory
  • 9-60010
Mercruiser Stern Drive
  • 27-48818
  • 27-488181
  • 27-48818Q01
1Thermostat Gasket N/A
18-2917GLM
  • 31560
GM
  • 3701777
Mallory
  • 9-60007
  • 9-60007-10
Mercruiser Stern Drive
  • 27-33179
  • 27-53045
  • 27-530451
  • 27-53045B1
  • F10077105
  • FI1101276
  • FI1101291
  • FI5000096
OMC Inboard
  • 3701777
OMC Stern Drive
  • 3701777
1Thermostat Gasket N/A
18-3551Chrysler Inboard
  • 4142885
Crusader
  • 96319
GLM
  • 13030
Mallory
  • 9-43013
Mercruiser Stern Drive
  • 32728
  • 35884
  • 59137
  • 59137A1
  • 67464
  • 8052731
  • 8072521
  • 807252T1
  • 8M0089715
Osco
  • 143-DEG
Pleasurecraft
  • RO26002E
1Thermostat N/A

Thermostat Kit
Your Price:
$16.99

Thermostat Kit

676-18-3651

Additional Details:

  • Temperature Rating: 142°F

Interchanges/Replaces

GLM

  • 13380

Mallory

  • 9-43152

List of Containing Parts

Sierra Item # OE/Competitor # Quantity Description Image Comments
18-2553GLM
  • 31460
Mallory
  • 9-60005
Mercruiser Stern Drive
  • 27-47510
  • 27-47510Q
Osco
  • 47510
1Thermostat Cover Gasket N/A
18-2554GLM
  • 31630
Mallory
  • 9-60006
Mercruiser Stern Drive
  • 27-41812
  • 27-41812B
  • 27-41812Q
  • 27-90556
Osco
  • 41812
1Thermostat Cover Gasket N/A
18-2834Barr
  • MC472760208
GLM
  • 31620
Mallory
  • 9-60011
Mercruiser Stern Drive
  • 27-60208
1Thermostat Cover Gasket N/A
18-2844Barr
  • MC472748818
GLM
  • 31510
Mallory
  • 9-60010
Mercruiser Stern Drive
  • 27-48818
  • 27-488181
  • 27-48818Q01
1Thermostat Gasket N/A
18-3551Chrysler Inboard
  • 4142885
Crusader
  • 96319
GLM
  • 13030
Mallory
  • 9-43013
Mercruiser Stern Drive
  • 32728
  • 35884
  • 59137
  • 59137A1
  • 67464
  • 8052731
  • 8072521
  • 807252T1
  • 8M0089715
Osco
  • 143-DEG
Pleasurecraft
  • RO26002E
1Thermostat N/A