flow rating 17056263 vs 17056261

[dhopkins52]

Is there any difference in the flow rating for a 17056263 from a 76 400 Pontiac versus a 17056261 from a 76 455 Pontiac.

[Cliff Ruggles]

All of the later front inlet Pontiac carburetors (non CCC) are the same castings.  They still may have different "flow ratings" as the 301 carburetors had a longer stop for the secondary airflaps, most of the others had the same length stop.....Cliff