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The L72 was a 427 cu in (7.0 L) 90° overhead valve V8 big-block engine produced by Chevrolet between 1966 and 1969. Initially rated at 450 horsepower, the rating dropped to 425 hp (317 kW) shortly after its release (although there was no change in power).
The Chevrolet Caprice is a full-size car produced by Chevrolet in North America for the 1965 through 1996 model years. Full-size Chevrolet sales peaked in 1965, with over a million units sold. It was the most popular car in the U.S. in the 1960s and early 1970s, which, during its production, included the Biscayne, Bel Air, and Impala.
Beginning in 1969, the highest performance 427 models were fitted with the new open (vs. closed) chamber cylinder heads, along with design improvements in crankshafts, connecting rods, and pistons, adopted from the Can-Am development program. Chevrolet gave all 427 engines except the ZL1 a torque rating of 460 lb⋅ft (624 N⋅m).
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The Statesman's optional V8 was the 245 kW (329 hp) version from the WK Caprice, with the WL Caprice's engine obtaining a further 5 kW (6.7 hp). The V8s received a stronger GM 4L65-E automatic transmission , while the Alloytec V6 versions received a new five-speed GM 5L40-E automatic.
Parts peculiar to this system include a toothed disc between the harmonic balancer and the crank pulley, the "adjacent sensor" (an early form of crankshaft position sensor), a special distributor, an engine temperature sensor, and a rudimentary computer mounted inside the car, under the dashboard.
The initial version for continuation was a 427 S/C model which was represented in the CSX4000 series. This was meant to continue where the last 427 S/C production left off, at approximately serial number CSX3360 in the 1960s. The initial CSX4000 series cars were completed from the chassis built by Mike McCluskey with NOS and reconditioned parts.
The all-new 1965 Biscayne was larger yet, and offered an even wider range of engines, including a new, larger 250-ci inline-six. For the 1967 model year the smaller 230 was dropped. For 1966 the top engine became the new Big-Block 427 ci V8, available in a high-powered, high-revving 425 hp (317 kW) version with solid lifters. Although not ...