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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.
Between 1966 and 1969 the L78 was the highest-horsepower engine available in Chevrolet's intermediate line via a Regular Production Option (RPO). Despite this, in 1969 an L72 427 cu in (7.0 L), 425 hp (317 kW) engine could be ordered in an intermediate via a Central Office Production Order (COPO).
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).
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).
A special 427 cu in (7.0 L) version of the 409 cu in (6.7 L) engine was used in the 1963 Chevrolet Impala Sport Coupe, ordered under Chevrolet Regular Production Option (RPO) Z11. This was a special package created for drag racers and NASCAR and included a 427 with aluminum body parts and a cowl-induction air intake system.
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 Chevrolet Biscayne was a series of full-size cars produced by the American manufacturer General Motors through its Chevrolet division between 1958 and 1975. Named after a show car displayed at the 1955 General Motors Motorama, the Biscayne was the least expensive model in the Chevrolet full-size car range (except the 1958-only Chevrolet Delray).
The police package (9C1) B-body cars featured a First Gear Block Out (FGBO) Plate on the transmission housing to prevent drivetrain damage. The shift point for first to second gear is about 43 MPH (69 km/h) while second to third gear shift point is about 83 MPH (134 km/h) assuming a 3.08:1 differential and a 5,500 RPM engine speed limit.