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Is there a difference in exhaust manifolds between auto/manual transmissions?
I have been looking for a set and some state that they were from a 4-speed car (or auto).... I'm confused. I thought they were the same.

Thanks.
 

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in some instances..ie: year and engine size,4 speed cars had a smog pump.

In 1968,all small block cars had a smog pump if they were a manual transmission.
 

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Ya -- I thought most (all?) of the manual trans cars got air injection manifolds and the auto's got the manifolds without air injection. There may be some a few exceptions to that though....
 
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