horsepower at 4, 700 rpm (engine codes ZK/ZS with manual transmission and ZM /ZN with automatic transmission) later in the model year. ... The base six had a single-barrel Rochester carburetor and hydraulic valve lifters. The Sprint version ( UPC W53) of the overhead-camshaft six-cylinder was similar to the standard engine, but it had a compression ratio of 10.5:1 and developed 215 ... the Firebird was based on the original Pontiac 287-ci Strato- Streak V-8 first used in 1955.
|Title||:||Original Pontiac Firebird and Trans Am 1967-2002|