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425–435 hp (317–324 kW) 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).
For the 1969 model year the ZL1 option was offered featuring an all-aluminum 427 cu in (7.0 L) big-block engine listed at 430 hp (321 kW) gross , but reported to produce 560 hp (418 kW), that propelled the car through the 1 ⁄ 4 mile (0.40 km) in 10.89 seconds. [47]
Perhaps the ultimate 427 for street applications was the 435 bhp (441 PS; 324 kW) at 5800 rpm and 460 lb⋅ft (624 N⋅m) at 4000 rpm of torque L71 version available in 1967 to 1969 Corvettes, and in the Italian Iso Grifo.
At 427.6 cubic inches, the Z06 was the largest small block ever offered by General Motors. Because of the Corvette's former use of 427 cubic-inch big blocks in the late-1960s and early 1970s, the LS7's size was rounded down to 427 cubic inches. Official output was 505 hp (377 kW; 512 PS) and has a 0–60 mph (0–97 km/h) time of 3.7 seconds.
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).
1966 Corvette Sting Ray Convertible 1966 Corvette Stingray Coupe 427 in Turquoise Metallic For the 1966 Corvette, the big-block V8 came in two forms: 390 hp (290 kW) on 10.25:1 compression, and 425 bhp via 11:1 compression, larger intake valves, a bigger Holley four-barrel carburetor on an aluminum manifold, mechanical lifters, and four ...