Expert
Posts: 1506
Location: Colo Spgs | Hola Zak
If one Exhaust Manifold has nothing other than Mounting Holes --- it is one Part Number,
If it has an un-used "boss" --- it has its Part Number,
Add a hole of any type into "The Boss" --- it has its Part Number.
The Left and Right Exhaust Manifolds are an example of this because The Right has a "Flapper".
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Some where in the 1965'ish area - the length of The Dumping Portion of MoPar's Big Block Exhaust Manifolds was extended ( every Raised Block Engine uses the same Part Number ).
Rodger & Gabby
COS
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