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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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Price: $94.85

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Availability: Discontinued
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. Ford part number C6AZ-9B289-E. 1967 California emissions only.

Price: $160.85

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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. Ford part number C6AZ-9B289-C. 1967 California emissions only.

Price: $109.85

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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.

Price: $69.85

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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.

Price: $171.85

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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...

Price: $225.85

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Availability: Out of Stock
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. Could also have a casting number of C8OE-9B289-B, the covers on the valves do have date codes imprinted along with the Carter valve number 4491-S. This is a hard part to keep on the shelves, so a...

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