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The Vortec 7400 L21 was a commercial version of the Chevrolet big-block engine used in the medium duty truck platform. Its design shared much with the L29 454, but with the addition of forged pistons and crankshaft, and coil near plug ignition. It had slightly reduced power compared to the L29 454 and used a different PCM.
The 454 engine option was available for the first half of the model year in the Chevelle and thus the 1975 Laguna had the 400 as the top engine. The 49-states' engine line-up was - the standard 145-horsepower 350 two-barrel V8, the optional 175-horsepower 400 four-barrel V8, and the 215-horsepower 454 four-barrel V8.
The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the 400 cu in (6.6 L) and the 455 cu in (7.5 L) big blocks used a stroke of 4.25 in (108 mm), with crankshaft material changed to cast iron except in a few rare cases.
Witte logo with engine. The Witte Iron Works was a maker of hit and miss engines. The company was started in 1870 by August Witte in Kansas City. His son Ed Witte built the company's first crude gasoline engine in 1886. In 1894 gas engines would be the company's primary focus. [1]
Power and performance were reduced. Engine offerings for 1971 included the 250-6, small-block V8s of 307 and 350 cubic inches; and big block V8s of 402 and 454-cubic-inch displacements. Horsepower ratings of those engines for 1971 ranged from 145 for the six to 365 for the RPO LS5 454 – all in gross figures. The LS6 454 V8 was gone forever.
The metric 200 three-speed automatic transmission became standard on all models and a new Chevrolet-built 229 cu in (3.8 L) V6 with 2-barrel Rochester carburetor replaced both the 200 cu in (3.3 L) V6 of 1979 and the Buick engine offered on all 1978 models and the 1979 Landau as the standard engine in 49 states (California cars continued to use ...