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All 1967–1968 400 CI engines had throttle restrictors that blocked the carburetors' secondaries from fully opening. [2] A "Ram Air" option was also available, providing functional hood scoops, higher flow heads with stronger valve springs, and a hotter camshaft. Power for the Ram Air package was the same as the conventional 400 HO, but peaked ...
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The 400 HO was offered as an option for 1967-1970 for GTO and 1968-1970 for Firebird. For 1969-1970 GTO the 400 HO included driver operable Ram Air induction and was renamed "400 Ram Air" for 1969 and just "Ram Air" for 1970. In the Firebird Ram Air induction for the 400 HO was a separate option for 1969 (included with Trans Am) and included ...
The 1967 model year saw the introduction of the Pontiac Firebird pony car, a variant of the Chevrolet Camaro. Intermediate-sized cars (Tempest, LeMans, GTO) were mildly face-lifted, but all full-size cars and GTO lost their Tri-Power engine option, though they did get a larger 400 cu in (6.6 L) V8 that replaced the previous 389.
1968 and 1969 400s shared the Olds big-block standard 4.25 in (107.95 mm) stroke with the 455 but used a undersquare 3.87 in (98.30 mm) bore to comply with GM's maximum 400 cu. in. displacement restrictions in the A-body cars while also reducing tooling costs. Displacement is similar to the earlier engine, at 399.9 cu in (6,554 cc).
The Pontiac Firebird went into production contemporaneously and on the same platform as the Camaro. Pontiac entered the Trans-Am Series in 1968, and a year later introduced the Trans-Am Firebird for public purchase. This option came with Pontiac's small journal-series 400 cubic inch engine, which did not qualify for homologation.
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This engine was used in the 1966-67 Tempest and Le Mans and 1967 Firebird. An optional high-performance Sprint version featured high-compression pistons, hotter cam, dual valve springs, split/dual exhaust manifold , stronger coil, and the then new Rochester Quadrajet carburetor. rated at 207 hp (154 kW). [ 5 ]