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The Turbo-Hydramatic or Turbo Hydra-Matic (THM) series was developed to replace both the original Hydra-Matic models and the Buick Dynaflow. In its original incarnation as the Turbo-Hydramatic 400, it was first used in the 1964 model year in Cadillacs. The Buick version, which followed shortly thereafter, was known as the Super-Turbine 400.
The 400 was made in 4-bolt main journal from 1970 to 1972 and in 2-bolt main journal from 1973 to 1979. The 400 can have either 2 or 3 frost-plugs per side though all 400 blocks have the provisions for a 3rd frost-plug on each side. The 400 was rated at 245–265 hp (183–198 kW) gross (150–180 hp (112–134 kW) SAE net) through its life ...
Chevrolet Turbo-Thrift engine (post-1962) Chevrolet 153 Inline 4 (Chevy II, pre-Iron-Duke - includes the Vortec 3000/181 industrial/marine crate motor) Detroit Diesel V8 6.2L and 6.5L; Duramax V8; Generation III V8s with modifications. These modifications include an additional bolt hole at the top of the pattern, and attachment points for cast ...
The 403 was never featured with a manual transmission and the crank was never manufactured for a pilot bearing. It was generally paired with the Turbo Hydramatic 350 3-speed automatic or the Turbo Hydramatic 400 3-speed automatic in rear wheel drive vehicles, in the case of front-wheel drive vehicles, the Turbo Hydramatic 425 FWD 3-speed ...
Engine ratings fell to 245 hp (183 kW; 248 PS) for the base Turbo-Fire 350 cu in (5.7 L) two-barrel, 270 hp (201 kW; 274 PS) for the Turbo-Fire 350-4V, and 300 hp (224 kW; 304 PS) for the Turbo-Jet 400. The SS 454 engine was raised to a nominal 365 hp (272 kW; 370 PS) rating despite the reduction in compression ratio.
In 1969 the 350 HO was upgraded again with the addition of the 400 HO cam, commonly referred to by enthusiasts as the 068 cam. Also added was the #48 casting number heads with a 68 cc (4.15 cu in) chamber for higher compression, along with larger 2.11 and 1.77 in (54 and 45 mm) valves.
The 400 cu in (6.6 L) B engine was introduced in 1972 to replace the venerable 383, and were power-rated via the net (installed) method. Chrysler increased the bore size of the 383 to create the 400. Its bore of 4.342-inch (110.3 mm) was the largest used in any production Chrysler V8 at the date of its introduction.
The smaller Turbo-Hydramatic 350 3-speed automatic was deemed suitable as the power output for the engine had significantly decreased from the earlier years. The TH350 drew less power and also did not require an electronic kick down system. The Pontiac L78 400 was standard in the Trans Am and the 455 was optional for both 1975 and 1976 models.