Reference Details
- Common issue
- Prototype-inspired restorations can add SD-455 and functional Ram Air hardware that Pontiac advertised but canceled.
- Confidence
- documented
- Correct value
- Regular-production 1973 GTOs use the L78 400 or L75 455 and nonfunctional production hood ducts
- Where to check
- PHS/order record, engine evidence, hood ducting, carburetor, air cleaner, and ownership history