0 Items
Ford 4.6 5.4 6.2 170 Degree Thermostat Reische Performance RP-Ford-4S

Ford 4.6 5.4 6.2 170 Degree Thermostat Reische Performance RP-Ford-4S

Your Price:$36.99
Retail Price:$46.99
MPT Saves You:$10.00(21%)
Part Number:RP-FORD-4S

Reische Performance 170 Degree Performance Thermostat FORD-4S

Fits the following:

2010-2014 Raptor 6.2L V8 - Ford Raptor SVT 2010 2011 2012 2013 2014

2011-2014 F-Series 6.2L V8 - Ford F150 2011 2012 2013 2014

1999-2015 F-Series 5.4L V8 - Ford F150 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015

1999-2004 & 2007-2010 Mustang GT 4.6L V8 - Ford Mustang 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

2002-2003 Harley Davidson F-150 5.4L V8 - Ford F150 HD Edition 2002 2003

1999-2004 Lightning 5.4L V8 - Ford Lightning SVT 1999 2000 2001 2002 2003

1999-2011 Crown Victoria 4.6L V8 - Ford Crown Victoria 1999 2000 2001 2002 2003 2004 2007 2008 2009 2010 2011

Reische Performance FORD-4S thermostats are custom made with the same size diaphragm and bypass control as the OEM units. Each thermostat is modified by hand using only U.S. made parts and then quality inspected to ensure consistent opening temps. These t-stats are the only ones specifically designed to fit this application, making them the best performing low temp units on the market!

This premium thermostat has a larger heat motor/spring assembly for more precise temperature control along with a heavy gauge, chrome plated steel housing. 100% made in the USA. Whether you are using an aftermarket radiator or not, this thermostat will provide your vehicle with the best possible heat dissipation from your setup along with a faster warm up time and better cold weather performance compared to a 160° unit or a thermostat with holes drilled in the diaphragm. They believe the 170° opening temp is the ideal balance for high performance engines, providing high flow to your radiator by mid-180 temps while still providing good all season performance. With proper fan settings your coolant temps in cool weather will be in the 170s and in hot weather the 180s, giving those running high levels of timing and/or boost added protection against engine-damaging detonation as well as maximum power output.

1-Year Guarantee

All Reische Performance thermostats come with a 1-year warrantee in which they will replace the thermostat free of charge should any failure occur.

Idle ECT Data/Notes for the FORD-4S

On August 12, 2009, the logging was conducted. the test vehicle was a 2002 Mustang 4.6L SOHC w/OEM Radiator. The Control conditions were 15 min. hot idle with A/C on low, the cooling fan on, the hood open, and IAT at 120°.

-The stock OEM thermostat was a Motorcraft RT1196 and sustained an ECT of 190°

-The 170° Reische Performance thermostat was a Ford 4-S and sustained an ECT of 174°


To fully take advantage of this upgrade the PCM/ECU will need to be calibrated with an MPT tune. If you already have an MPT Tune, just submit an MPT Tune Form. Please allow three business days for MPT tunes to be built/updated.


If your vehicle's Motorcraft thermostat cross-references to any of the number(s) below, then the corresponding Reische unit is guaranteed to fit your application.

















Superseded by RT-1196

Superseded by RT-1196

Superseded by RT-1196

Navigator & Early 6.8L

Superseded by RT-1196

F-150 Lightning- 180°

Excursion 6.8L & SD 6.8L

Superseded by RT-1196

Superseded by RT-1196

Super Duty 6.8L

Superseded by RT-1196

Latest Super Duty 6.8L


Truck 6.2L-194°

5 Stars
No brainer!
Ordered the 170f thermostat at same time as tuner and custom tunes for my 5.4 F-150. Anxious me just had to try out the tunes first. I immediately noticed detonation when accelerating and realized it needed the thermostat swap to help it run cooler. Quickly did the swap (5 minute job) and pinging disappeared for for good. This is a cheap item that allows your motor to run cooler (confirmed via gauge) and possibly add some more timing.
Did you find this helpful?  0 of 1 Found Helpful
Reviewed by:  from Central Florida. on 7/13/2015

Recently Viewed Items