1967 - 1970 Mercury Cougar / Ford Mustang Anti Backfire Valves - Thermactor at West Coast Classic Cougar :: The Definitive 1967

Office/Warehouse Closed Dec 24 - Dec 29 & Jan 1.

International Customers Click Here [Updated 12/2024]

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

CANADIAN CUSTOMER: Due to the Canada Postal Service strike, we recommend choosing DHL Express.
Note: UPS Mail Innovations is NORMALLY delivered by the post office, however UPS has transitioned all Canadian-bound shipments to a non-postal delivery service.

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.

Mercury Cougars had Thermactor smog systems from their inception in 1967, but only those cars destined for California, District Sales Office (DSO) numbers 52 and 53 on your door data plate. The Thermactor emissions system injects air into the exhaust manifolds, which when mixed with the hot exhaust gases further promotes the burning of the hydrocarbons and carbon monoxide. Also called 'Backfire Suppressor Valve'. Starting in 1968 the Thermactor smog system was used on nearly all gasoline engines equipped with manual transmissions across all of the Ford car lines in all 50 states. *Note excludes Canada, which received the Ford IMCO systems. Additionally the Thermactor system was used on high performance engines with factory installed Holley carburetors, regardless of transmissions. Which include 390GT engines, 428 Cobra Jets engines, 427-4V GT-E?s, and Boss 302 Eliminators. In most cases the thermactor smog parts that West Coast Classic Cougars sells will be used and we cannot guarantee that after 40 years certain parts such as the anti-backfire valves and canisters, check valves or air pumps will still function like new. We are not even sure that some of these parts lasted until the oil embargo in 1974. We estimate that the majority of those show cars seen with vintage factory smog systems are ?just for show?, but they sure do greatly increase the value of our cars when sold at auction.

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Products (Click sub-categories above to ONLY display results for that Sub-Category) 1-12 of 12

Valve - Anti Backfire - 289 - Used ~ 1967 Mercury Cougar / 1967 Ford Mustang

1967 Mercury Cougar
1967 Ford Mustang

Price: $94.86

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 23947 -

Mounts on the rear of either the 289-2V or 289-4V factory cast iron intake manifold. This valve has three equal sized vacuum hose fittings in addition to the steel line going to an intake manifold vacuum source. Due to the age of these valves, we cannot guarantee that they will work. Consider this valve non-functional. Ford part number C6OE-E or C6AZ-9B289-E. 1967 California emissions only.

Valve - Anti Backfire - 390 - Used ~ 1967 Mercury Cougar / 1967 Ford Mustang

1967 Mercury Cougar
1967 Ford Mustang

161

Price: $160.88

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 23905 -

Mounts on the rear of the intake manifold, it must be a 1967 or possibly a 1966 "S" intake manifold. There are no mounting provisions on 1968 or later factory cast iron intake manifolds. This valve has two equal sized vacuum hose fittings in addition to the steel line going to an intake manifold vacuum source. Due to the age of these valves, we cannot guarantee that they will work. Consider this valve non-functional. Ford part number C6AE-E or C6AZ-9B289-C. 1967 California emissions only. ...

Valve - Anti Backfire - Carter 4491S - 1-2-68 - Used ~ 1968 - 1970 Mercury Cougar / 1968 - 1970 Ford Mustang

1968 Mercury Cougar
1969 Mercury Cougar
1970 Mercury Cougar
1968 Ford Mustang
1969 Ford Mustang
1970 Ford Mustang

183

Price: $225.86

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 24404 -

Wide range of applications, which also include: 289-2V (C code engine), 302-2V (F code engine), 302-4V (J code engine) - Only 1968, and only with manual transmissions either 3 speed or 4 speed. 1968 390-4V, with any transmission. 1968 427-4V GT-E, and 1968 - 1970 428 Cobra Jet and Super Cobra Jet. Typical core valve, will not function. Basically selling a non functional smog part with a desirable date of 1/2/1968. Could also have a casting number of C8OE-9B289-B, the covers on the valves do...

Valve - Anti Backfire - Carter 4491S - 10-12-67 - Used ~ 1968 - 1970 Mercury Cougar / 1968 - 1970 Ford Mustang

1968 Mercury Cougar
1969 Mercury Cougar
1970 Mercury Cougar
1968 Ford Mustang
1969 Ford Mustang
1970 Ford Mustang

183

Price: $225.85

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 33459 -

Wide range of applications, which also include: 289-2V (C code engine), 302-2V (F code engine), 302-4V (J code engine) - Only 1968, and only with manual transmissions either 3 speed or 4 speed. 1968 390-4V, with any transmission. 1968 427-4V GT-E, and 1968 - 1970 428 Cobra Jet and Super Cobra Jet. Typical core valve, will not function. Basically selling a non functional smog part with a desirable date of 10/12/1967. Could also have a casting number of C8OE-9B289-B, the covers on the valves do...

Valve - Anti Backfire - Carter 4491S - 2-21-68 - Used ~ 1968 - 1970 Mercury Cougar / 1968 - 1970 Ford Mustang

1968 Mercury Cougar
1969 Mercury Cougar
1970 Mercury Cougar
1968 Ford Mustang
1969 Ford Mustang
1970 Ford Mustang

183

Price: $225.85

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 33458 -

Wide range of applications, which also include: 289-2V (C code engine), 302-2V (F code engine), 302-4V (J code engine) - Only 1968, and only with manual transmissions either 3 speed or 4 speed. 1968 390-4V, with any transmission. 1968 427-4V GT-E, and 1968 - 1970 428 Cobra Jet and Super Cobra Jet. Typical core valve, will not function. Basically selling a non functional smog part with a desirable date of 2/21/1968. Could also have a casting number of C8OE-9B289-B, the covers on the valves do...

Valve - Anti Backfire - Carter 4491S - 3-19-68 - Used ~ 1968 - 1970 Mercury Cougar / 1968 - 1970 Ford Mustang

1968 Mercury Cougar
1969 Mercury Cougar
1970 Mercury Cougar
1968 Ford Mustang
1969 Ford Mustang
1970 Ford Mustang

183

Price: $225.85

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 33455 -

Wide range of applications, which also include: 289-2V (C code engine), 302-2V (F code engine), 302-4V (J code engine) - Only 1968, and only with manual transmissions either 3 speed or 4 speed. 1968 390-4V, with any transmission. 1968 427-4V GT-E, and 1968 - 1970 428 Cobra Jet and Super Cobra Jet. Typical core valve, will not function. Basically selling a non functional smog part with a desirable date of 3/19/1968. Could also have a casting number of C8OE-9B289-B, the covers on the valves do...

Valve - Anti Backfire - Carter 4491S - 4-23-68 - Used ~ 1968 - 1970 Mercury Cougar / 1968 - 1970 Ford Mustang

1968 Mercury Cougar
1969 Mercury Cougar
1970 Mercury Cougar
1968 Ford Mustang
1969 Ford Mustang
1970 Ford Mustang

183

Price: $225.85

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 33456 -

Wide range of applications, which also include: 289-2V (C code engine), 302-2V (F code engine), 302-4V (J code engine) - Only 1968, and only with manual transmissions either 3 speed or 4 speed. 1968 390-4V, with any transmission. 1968 427-4V GT-E, and 1968 - 1970 428 Cobra Jet and Super Cobra Jet. Typical core valve, will not function. Basically selling a non functional smog part with a desirable date of 4/23/1968. This valve has the date stamped so that it is visible when looking at the...

Valve - Anti Backfire - Carter 4491S - 8-16-67 - Used ~ 1968 - 1970 Mercury Cougar / 1968 - 1970 Ford Mustang

1968 Mercury Cougar
1969 Mercury Cougar
1970 Mercury Cougar
1968 Ford Mustang
1969 Ford Mustang
1970 Ford Mustang

183

Price: $185.00

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 33457 -

Wide range of applications, which also include: 289-2V (C code engine), 302-2V (F code engine), 302-4V (J code engine) - Only 1968, and only with manual transmissions either 3 speed or 4 speed. 1968 390-4V, with any transmission. 1968 427-4V GT-E, and 1968 - 1970 428 Cobra Jet and Super Cobra Jet. Typical core valve, will not function. Basically selling a non functional smog part with a desirable date of 8/16/1967. Could also have a casting number of C8OE-9B289-B, the covers on the valves do...

Valve - Anti Backfire - Carter 4491S - 9-5-67 - Used ~ 1968 - 1970 Mercury Cougar / 1968 - 1970 Ford Mustang

1968 Mercury Cougar
1969 Mercury Cougar
1970 Mercury Cougar
1968 Ford Mustang
1969 Ford Mustang
1970 Ford Mustang

183

Price: $225.86

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 33454 -

Wide range of applications, which also include: 289-2V (C code engine), 302-2V (F code engine), 302-4V (J code engine) - Only 1968, and only with manual transmissions either 3 speed or 4 speed. 1968 390-4V, with any transmission. 1968 427-4V GT-E, and 1968 - 1970 428 Cobra Jet and Super Cobra Jet. Typical core valve, will not function. Basically selling a non functional smog part with a desirable date of 9/5/1967. This valve has the date stamped so that it is visible when looking at the...

Valve - Anti Backfire - Service Replacement - BOSS 302 - Used ~ 1969 - 1970 Mercury Cougar / 1969 - 1970 Ford Mustang

1969 Mercury Cougar
1970 Mercury Cougar
1969 Ford Mustang
1970 Ford Mustang

Price: $95.27

Buy Details

Availability: Used / Wrecking Yard Item

Item #: 24464 -

C8TE-B-SR Correct service replacement 4490-S Carter anti backfire valve, but without the outer cover having the concours correct stampings. These units are used, not tested and one should assume they are non-functional.

Valve - Anti Backfire - Carter - 289 / 302 / 390 GT / 427 GT-E / 428CJ - Service Replacement - Used ~ 1968 - 1970 Mercury Cougar / 1968 - 1970 Ford Mustang

1968 Mercury Cougar
1969 Mercury Cougar
1970 Mercury Cougar
1968 Ford Mustang
1969 Ford Mustang
1970 Ford Mustang

Price: $69.89

Buy Details

Availability: Out of Stock

Item #: 24409 -

C8OE-C-SR WCCC Carter service replacement anti backfire valve, but without the outer cover having the concours correct stampings.These units are used, not tested and one should assume they are non-functional.

Valve - Anti Backfire - Carter 4490S - BOSS 302 Eliminator - Used ~ 1969 - 1970 Mercury Cougar / 1969 - 1970 Ford Mustang

1969 Mercury Cougar
1970 Mercury Cougar
1969 Ford Mustang
1970 Ford Mustang

172

Price: $171.86

Buy Details

Availability: Out of Stock

Item #: 24461 -

Carter manufactured valve with C8TE-9B289-B and 4490-S imprinted on the valves' cover. Another hard to find part with correct date codes specific to Boss 302. Ford part number C8TZ-9B289-A. These units are used, not tested and one should assume they are non-functional. These units are used, not tested and one should assume they are non-functional. *Note, we try to carry later manufactured 'Service replacement' Carter anti backfire valves which are in every way the same, but...