AMC Exhaust Manifolds

Source: Peter Marano at Thu, 01 Aug 2002 09:49:40 -0500.

1966 through 1969

All V/8 exhaust manifolds have the same size and shape.

Manual transmissions have air injection reaction (AIR) tubes,
automatics do not. I do not know about California emissions.

1970
All V/8 exhaust manifolds have the same size and shape as '66 through '69,
but the ports are shaped to fit dogleg ports on the cylinder head.

Rebel Machine is an exception, same size and shape, but outlet fits
2-1/4 exhaust pipes.

Manual transmissions have air injection reaction (AIR) tubes,
automatics do not. I do not know about California emissions.

1971 through 1974

Most V/8 exhaust manifolds have "free flow" shape, fit 2-1/4 exhaust pipes.

Gremlin and Hornet are exceptions, right side "free flow" will not clear
strut rod bracket, Gremlin and Hornet have a right side manifold the size
and shape of 1970.

Manual transmissions have air injection reaction (AIR) tubes,
automatics do not. I do not know about California emissions.

1975 through 1979

Most V/8 exhaust manifolds have "free flow" shape, fit 2-1/4 exhaust pipes.
Gremlin, Hornet, Spirit and Concord are one exception, right side "free flow"
will not clear strut rod bracket, Gremlin, Hornet, Spirit and Concord have
a right side manifold the size and shape of 1970.

Pacer is another exception, left side "free flow" does not fit, left side
Pacer manifold is similar to 1970, but has heat stove for the choke. (Pacer
left side manifold was also used on "J" series Jeep 1980 through 1990 (Right
side Jeep manifold is "free flow"))

There are other exceptions including Matador Coupe (1975 through 1978)and 1973
304, see parts book for details.

In the interest of accuracy please post any additions or correction.

Peter Marano
Kenosha WI