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351w part identification

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Old Apr 12, 2026 | 11:24 PM
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351w part identification
Can anyone tell me what this tube is called?
the one with the holes. This is on the back side of a 1995 F250 with a 351w.
 
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Old Apr 13, 2026 | 12:37 AM
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Air injection manifold. Smog pump pumps into it and it connects to the cylinder head which distributes the air to the exhaust.
 
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Old Apr 13, 2026 | 05:24 AM
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It is part of the Thermactor system, if looking for the technical name.
 
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Old Apr 13, 2026 | 07:09 AM
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Standard Motor Products AT129
 
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Old Apr 13, 2026 | 12:57 PM
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Awesome! thanks guys
 
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Old Apr 22, 2026 | 07:13 PM
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yeah, mine did that, too.

And of course, the ends are rusted solidly into the head.

It's not much fun to get to, is it?

t
 
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Old Apr 22, 2026 | 08:05 PM
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FWIW, if anyone needs one of those factory 'across the rear of the engine' 351W AIR tubes, I have one that I'll never use (I had bought it for my 351W-based stroker, but never needed). NOS, never used. PM me. $20 + actual shipping and it is yours!
 
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