• 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Correct thermostat
Need some advice on the correct thermostat for a 351C 2V engine. I’ve seen both 180 and 190 degree thermostats out there. Which one is the best to keep the engine cool and any other information that would help.
I'm running a 180 degree with no issues. Just make sure you get a thermostat for a 351C not the one for the 351W, some parts places will tell you it makes no difference but it does.


M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
+1 on J and J posting. This may help. http://www.7173mustangs.com/thread-ever-...thermostat
180 is what I run currently in the 408C. On a stock or near stock engine the 192 will work fine if the rest of the cooling system is functioning properly. Chuck
Yes, make sure the thermostat is for a Cleveland, there is a big difference. I am running a 180.
Here is a brief article about the difference.



[Image: 1_11_11_13_11_50_27.png]
Ditto on the 180 degree.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
One benefit of the Cleveland having large intake and exhaust ports is to help keep
the engine cool, more airflow through the manifolds. That is why the intake
manifold is dry.


[Image: 1_11_11_13_11_50_27.png]
Make sure you have the brass restrictor plate, if you're using a stock style water pump. Some after market ones apparently do not need the restrictor or the Cleveland specific thermostat. Summit part number BRA-333-180 used to include the 180 degree t-stat and the brass restrictor, but I don't see any mention of the restrictor, now.
The 180 Stant numbers are 29468 & 13468, 192 are 29469 & 13469.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
Nice info I picked up a 180 from Mr Gasket which states its for regular and Higher RPM engines. Thanks a bunch
351C Thermostat...

Prior to using a CLEVELAND TYPE thermostat, make sure you have a
351C Coolant Bypass Restrictor Plate in your motor. If your motor has ever been hot tanked(typical during a rebuild), chances are this plate has been removed/destroyed during the process.

If you do not have a restrictor plate, then you need to get one of these:


This plate will work with the NON 351C thermostat.

Here is a description from the web page:
It has been an accepted fact for decades now that the 351 Cleveland bypass system was not the greatest idea Ford ever came up with. The unique 351c thermostat "hat" never seals well, causing a certain portion of coolant to just circulate through the block and never make it to the radiator. Years ago, the Pantera enthusiasts (all Panteras had cooling issues from the factory BTW) found that if they soldiered a penny into the hole in their restriction plate and used a standard small block Ford thermostat, their cooling issues all but disappeared. That trick worked fine until Ford discontinued the brass restrictor plate. This aluminum unit is designed to be installed as-is in conjunction with a standard thermostat , you cannot use the 351 Cleveland unique thermostat with this block off plate. The tiny hole in the center is for air bleed only.

Even with this, I do not understand the comment "worked find until Ford discontinued the brass restrictor plate".

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
Great info, Z. I thought the same thing when I read that about the restrictor/restriction plate. Why would Ford discontinue it?


[Image: 6y14ea.jpg]

Project started 8-7-10
Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system
Current "mini-project": interior upgrade Undecided
Share Thread:  

Possibly Related Threads...
Thread Author Replies Views Last Post
  Correct 351C Thermostats 73pony 12 374 08-19-2018, 10:40 AM
Last Post: Carolina_Mountain_Mustangs
  Need Correct Engine Idle Speed 73StangCoupe 16 3,462 03-13-2018, 12:53 PM
Last Post: Don C
  The dreaded thermostat and cooling issue post Wyostang 12 1,372 07-26-2017, 03:42 AM
Last Post: gpierce
  Water restrictor plate thermostat CalgaryChris 5 980 03-03-2017, 08:52 PM
Last Post: CalgaryChris
  Snapped thermostat-housing bolts Vinnie 72 7,587 05-25-2016, 08:13 AM
Last Post: jpaz
  Is this a correct linkage for a C6? FirstMach1 2 599 05-22-2016, 07:24 PM
Last Post: FirstMach1
  Correct way to reinstall the rear window? Mexican 5 973 10-11-2015, 06:32 PM
Last Post: Mexican
  correct 4300 carb Twins 4 1,105 06-02-2015, 10:10 AM
Last Post: jeff8877

Users browsing this thread: 1 Guest(s)