Reference Details
- Common issue
- A replacement or service carburetor may not carry the same production stamp as the carburetor originally installed on a specific L75/M21 car.
- Confidence
- documented
- Correct value
- 1976 Firebird 455 4-bbl manual-transmission application is listed with a first-type Rochester carburetor stamped 17056261, superseded by 17053863, and a second-type Rochester carburetor stamped 17056263
- Where to check
- Stamped identification number on the Rochester carburetor body; verify against build timing and emissions/application paperwork for an individual car
