CANADIAN CUSTOMER: Due to the Canada Postal Service strike, we recommend choosing DHL Express.
Note: UPS Mail Innovations is delivered by the post office and Canadian deliveries will be affected by the strike.

International Customers Click Here [Updated 6/2024]

International Customers

Due to some ongoing challenges with the software we use to generate customs data and print shipping labels for international orders,
orders may take upto 7 days before we are able to generate the shipping label. If the order has USED item or items that need to be shipped from the supplier to us, it can take significantly longer.

Also be aware that even though we ship items with the proper documentation to show that duties and taxes are prepaid, some Postal Services are ignoring this and still charging these fees at delivery. If this occurs to you, please send us a copy of the receipt showing the tracking number with the fees paid and we can get the Duties/Taxes we charged to you refunded.

UK Customers / EU Customers

We are using a new shipping service where international shipments now include the Duties/Tax/Fees, so currently we can not offer USPS/Mail Innovations if the order is over 135GBP/150EUR, since USPS can not pay duties/taxes. If the order is less than 135GBP/150EUR, we can pay the taxes directly to the EU/UK and we can ship USPS/Mail Innovations*. All orders over 135GBP/150EUR have to ship UPS/DHL so we can use DDP to cover the Duties/Tax/Fees. This has allowed us to resume shipments of any value to the UK and EU.

TIP: You will likely be able to ship your order for less cost if you ship any items over 135GBP/150EUR on one order via UPS, then break the rest of the order up into orders of less than 135GBP/150EUR.

By breaking your orders up into less than 135GBP/150EUR:

you will avoid the import duties on those orders
less expensive shipping methods are available
you will avoid some UPS fees

Canadian Customers

We have worked with UPS to waive some of the brokerage fees. The rates shown now include all UPS fees. We have also added DHL, which offers lower cross boarder fees.

Our shipping provider has added Duties Prepaid options for US Postal Service options to Canada. This has allowed us to resume USPS shipments to Canada.

However, beware that this is a new process for the Post Office, so sometimes Canada Post shows the duties and taxes COD, when they are actually prepaid. If this happens, first inform Canada Post that the shipment was sent duties prepaid (DDP). If they still require you to pay the duties before delivery, please contact us.

Turkey Customers

The international shipping software we use requires that we pre-collect and pre-pay the duties and taxes. Because of recent changes to Turkey import laws, Turkey no longer supports this. Because of this you will need to use a shipping broker for us to ship items to you.

US Postal Service (USPS)

Our new international shipping system supports international shipments via USPS only if the order total (including shipping to most countries) is below the Duty/Tax De Minimis for your country (View De Minimis Chart).
Exceptions:
UK orders upto 135GBP
EU orders upto 150EUR

The US Postal Service (USPS) has suspended services to over a dozen countries (see complete list).
UPS Worldwide Services \ DHL Worldwide can still be delivered to these locations.

This side up

Water Restrictor Plate - Modified - 351C - New ~ 1970 - 1973 Mercury Cougar / 1970 - 1973 Ford Mustang

Reproduction 351 Cleveland Water Restriction Plate for the 1970 1971 1972 and 1973 Mercury Cougar and Ford Mustang

Any 351 Cleveland

1970 Mercury Cougar
1971 Mercury Cougar
1972 Mercury Cougar
1973 Mercury Cougar
1970 Ford Mustang
1971 Ford Mustang
1972 Ford Mustang
1973 Ford Mustang

32 Review(s) 0

Item #: 53234

Price: $24.55

Cost: 1964

Earns: 99

Bonus: 0

Item #	Description/Size	Availability	Qty Break	Price
In-Stock Item Item #: 14330
14330	Thermostat Housing Gasket for the 351 Cleveland.	Thermostat Housing Gasket for the 351 Cleveland.	1	$2.42
In-Stock Item Item #: 41407
41407	195° Thermostat for the Small Block in the 1967 - 1973 Mercury Cougar / Ford Mustang	195° Thermostat for the Small Block in the 1967 - 1973 Mercury Cougar / Ford Mustang	1	$12.36 $7.42
In-Stock Item Item #: 41408
41408	180° Thermostat for the Small Block in the 1967 - 1973 Mercury Cougar / Ford Mustang	180° Thermostat for the Small Block in the 1967 - 1973 Mercury Cougar / Ford Mustang	1	$12.36 $7.42
In-Stock Item Item #: 41409
41409	160° Thermostat for the Small Block in the 1967 - 1973 Mercury Cougar or Ford Mustang	160° Thermostat for the Small Block in the 1967 - 1973 Mercury Cougar or Ford Mustang	1	$10.15 $6.09

Availability

In-Stock Item - Ships: Next Business Day

Applications

1970 Mercury Cougar
1971 Mercury Cougar
1972 Mercury Cougar
1973 Mercury Cougar
1970 Ford Mustang
1971 Ford Mustang
1972 Ford Mustang
1973 Ford Mustang

Description

New water restrictor plate for the Mercury or Ford equipped with the 351 Cleveland engine. It has been an accepted fact for decades now that the 351C 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, 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.

NOTE: The restrictor plate is installed "hat" down, as shown in the first picture above.

This aluminum unit is designed to replace the brass plate and be installed as-is. Simply remove the original brass plate and tap this one back in its place. This unit must be used in conjunction with a standard thermostat , you cannot use the 351C unique thermostat with this block off plate. The tiny hole in the center is for air bleed only. Want to find out how to use a penny instead of purchasing this plate? Click hear to learn more!

On a record hot day in Evansville, In at 108 degrees the car was driven a while. She never went over 200. Im so happy with this upgrade, get the WCCC part and a 160 thermostat and your problems are cured!

Replaces Ford Part number D0AZ-8K517-A.

Check out this video

For some helpful tips on upgrading your Cougar (or Mustang) cooling system, check out our video:

Specifications:

Shipping Weight: 0.02 LBS

(weight shown may be the dimensional weight)

32 Reviews (4.91 of 5 Rating)

4.91 out of 5 stars
Based upon 32 Review(s).

5 Stars

87%

4 Stars

3 Stars

2 Stars

1 Stars

Write a review!

Lynn Koglin 1973 Cougar XR7

Louisville CO

2013

No more overheating!

1/26/2023

5.00 out of 5

Material:

Fit:

Craftsmanship:

Correctness:

Pros:

Cons:

Product worked as advertised! I wish I would have found this before replace radiator.

Jim O 1973 Mustang 351c

2020

It’s a Christmas Miracle! 73 Mustang 351cleveland

5/28/2022

5.00 out of 5

Material:

Fit:

Craftsmanship:

Correctness:

Pros:

Works as described

Cons:

None

This was installed along with a 160 thermostat. Before the needle was always near the top end of the range near hot. Now after this it’s in the middle at the highest temp. It does exactly as it says. Bypasses so the coolant actually goes through to cool the engine instead of flowing back to the water pump. Highly recommend you get one of experiencing running hot.

LCK

Louisville CO

2013

So far so go!

4/30/2022

5.00 out of 5

Material:

Fit:

Craftsmanship:

Correctness:

Pros:

30 minute install.

Cons:

I put this in my 1973 Cougar 2 weeks ago. I have driven it about 100 miles. No more running hot at idle! I can't believe it took me years to find this product. I would highly recommend this if your 351 C is running hot. I would suggest WCC to have this populate when searching for cooling items for 351 C.

Arnaud

France

2018

A breeze to install

2/24/2022

5.00 out of 5

Material:

Fit:

Craftsmanship:

Correctness:

Pros:

Cons:

managed to remove original restrictor plate with 2screwdrivers, and install this new plate without issues.

E Childs

Staten Island nyc

2016

Modified water restrictor plate

7/13/2020

5.00 out of 5

Material:

Fit:

Craftsmanship:

Correctness:

Pros:

Great product

Cons:

None

Excellent product, works great, 170 deg with a 160 deg thermostat on a 92 deg day. Could use some instruction on removing the old plate. Text to support, said to use channel locks to pry out the old. Used a 7 inch channel and crushed the bottom of the old plate a bit then it mostly pried right out. Took about 15 min to get out. New one went right in using a socket to press it in place using a hammer

Product Q&A

Number of questions: 0

Please login to ask a question.

Click here to help us improve this product listing

Frequently purchased with:

Frequently
Purchased With

Item #: 30466 [More info]
[More info] Thermostat - 351C - 180 Degree - Concours Correct - PREMIUM - Repro ~ 1970 - 1973 Mercury Cougar / 1970 - 1973 Ford Mustang
Reproduction concours correct premium thermostat for the 351C. This is the correct thermostat you would use in conjunction with the new concourse restrictor / by-pass plate on 70 - 73 Cougars and Mustangs equipped...

Buy

$42.95
Frequently
Purchased With

Item #: 14329 [More info]
[More info] Thermostat - 351C - 195 Degree - OEM - Repro ~ 1967 - 1973 Mercury Cougar / 1967 - 1973 Ford Mustang
Fits all* Ford V-8 engines, 1967 - 1973. *- NOTE: This will fit in the 351C, 351M or 400 but will not block off the port to recirculate the water back through the engine. This can cause the engine to run...

Buy

$19.18
Frequently
Purchased With

Item #: 14292 [More info]
[More info] Thermostat Housing - 351C - CHROME - Repro ~ 1970 - 1973 Mercury Cougar / 1970 - 1973 Ford Mustang
Cast construction with very good quality chrome. Looks great with chrome valve covers and air cleaner. Replaces Ford Part #: D0ZZ-8592-A.

Buy

$25.44
Frequently
Purchased With

Item #: 15293 [More info]
[More info] Thermostat - 192 Degree - 351C - Repro ~ 1970 - 1973 Mercury Cougar / 1970 - 1973 Ford Mustang
195 Degree Thermostat for the 351C, 351M or the 400. Factory spec temp for these engines is 192 degrees. Properly blocks off port that recirculates the water through the engine.

Buy

$12.36
Frequently
Purchased With

Item #: 12979 [More info]
[More info] Thermostat - 160 Degree - FAIL SAFE - Repro ~ 1967 - 1973 Mercury Cougar / 1967 - 1973 Ford Mustang
This fail safe thermostat can save you from costly engine damage during an overheat. They feature an exclusive technology that locks the valve open position if overheating occurs. This allows for maximum coolant...

Buy

$19.18
Frequently
Purchased With

Item #: 14332 [More info]
[More info] Thermostat - 351C - 180 Degree - OEM - Repro ~ 1967 - 1973 Mercury Cougar / 1967 - 1973 Ford Mustang
Fits all* Ford V-8 engines, 1967 - 1973. *- NOTE: This will fit in the 351C, 351M or 400 but will not block off the port to recirculate the water back through the engine. This can cause the engine to run...

Buy

$19.18
Frequently
Purchased With

Item #: 41408 [More info]
[More info] Thermostat - 180 Degree - Repro ~ 1967 - 1973 Mercury Cougar / 1967 - 1973 Ford Mustang
For use in any 1967-1973 Mercury Cougar except for the 351c in stock configuration. Will work on 351c when you use this Bypass / Restriction plate conversion part. Check out this video...

Buy

$12.36
Frequently
Purchased With

Item #: 10656 [More info]
[More info] Thermostat Housing - 351C - Repro ~ 1970 - 1973 Mercury Cougar / 1970 - 1973 Ford Mustang
Thermostat water neck or 'Connection - Water Outlet' as it is called in the Ford manuals. Fits 1970-73 351C or 351 Cleveland engines as found in 1970-73 Mercury Cougars and most all other Fords with the 351C...

Buy

$28.67
Frequently
Purchased With

Item #: 14330 [More info]
[More info] Gasket - Thermostat Housing - 351C - Repro ~ 1970 -1973 Mercury Cougar / 1970 -1973 Ford Mustang
Thermostat Housing Gasket BY FEL-PRO® for the 351 Cleveland.

Buy

$2.42
Frequently
Purchased With

Item #: 30465 [More info]
[More info] Water Restrictor Plate - 351C - Repro ~ 1970 - 1973 Mercury Cougar / 1970 - 1973 Ford Mustang
Reproduction water bypass plate for all Ford 351C engines. This is an original style brass restrictor plate for 70-73 Cougar, Mustang, Torino etc.Must be used in conjunction with the correct 180 degree...

Buy

$27.35
Frequently
Purchased With

Item #: 14334 [More info]
[More info] Thermostat - 351C - 160 Degree - OEM - Repro ~ 1967 - 1973 Mercury Cougar / 1967 - 1973 Ford Mustang
Fits all* Ford V-8 engines, 1967 - 1973. *- NOTE: This will fit in the 351C, 351M or 400 but will not block off the port to recirculate the water back through the engine. This can cause the engine to run...

Buy

$17.28
Frequently
Purchased With

Item #: 41409 [More info]
[More info] Thermostat - 160 Degree - Repro ~ 1967 - 1973 Mercury Cougar / 1967 - 1973 Ford Mustang
For use in any 1967-1973 Mercury Cougar except for the 351c in stock configuration. Will work on 351c when you use this Bypass / Restriction plate conversion part. ...

Buy

$10.15

<p>I have enjoyed dealing with Don and his group for years and now that I own more cougars the need is greater than ever. I look forward to their videos and easier ways to assemble they have been most helpful. I can navigate there catalog...

- Dean

Read More Testimonials

I bought my 69 Cougar in Jul of '09 as a retirement from the Army gift to myself. From day 1 it had intermittent heating problems that I tried to fix. I changed the radiator, thermostat, water pump, and added 2 12 in 1400 cfm electric cooling...

- MartinD

Read More Testimonials

My 1971 Cougar XR7 was retrofitted with a Ford “400”, Edelbrock intake and 4 barrel carb, TCI Street Fighter trans, B & M Hammer shifter, and dual turbo exhaust. While this sounds interesting, the Cougar itself was seriously neglected and...

- Frank

Read More Testimonials

Just got my quarter window glass installed in my restored quarter window frames; could not be happier! ...

- Mike Dunlap

Read More Testimonials

WCCC hooked me up with an original glove box cable and the correct screws WITH shoulders for my glove box. Their listing for these screws explains that the original screws have a shoulder for the cable and most people put in the wrong screws--which...

- Jim Davis

Read More Testimonials

I have been a cougar owner for just shy of 30 years, I have been dealing with part problems for a very long time. The people at WCCC have always be honest, and overly helpfull. I now have a 1970 XR-7 mostly rebuilt, and my son has a 1968 base...

- Voodochild5

Read More Testimonials

What did you LIKE about your experience? * : I am fairly new to WCCC, four or five orders (at the time of writing), but I am blessed to have found WCCC for sure. I had a small problem, couldn't find anything to work for the condensation drain on my...

- Kenneth Milden

Read More Testimonials

I have been working with Don Rush and his team for close to 20 years. In all of these years with many sales transactions I can say they have been 2nd to none. They have always been not only helpful but extremely knowledgeable. I certainly continue...

- Denver

Read More Testimonials

I have made many purchases online with WCCC but chose this time to make a 1400 mile round trip and visited them in person. I brought a van load of parts with me that needed a home. Don helped unload them then quickly assessed the value which I...

- pandamonium2112

Read More Testimonials

I just wanted to let you know that my order which was shipped (via UPS Mail Innovations) December 05 was at my front door, having gone thru Canada customs, on December 16. It arrived in excellent shape. Kudos to you guys, UPS, and the USPS for...

- Rod (Saskatchewan, Canada)

Read More Testimonials

E3D15