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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).
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).
Chevrolet Performance, formerly "GM Performance Parts", is an automotive performance parts brand that sells everything from camshafts and cylinder heads to high-performance crate engines and upgrades for late-model Chevrolet vehicles. It was founded in 1967 to support the Trans-Am Camaro race teams.
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.
The Chevrolet Impala (fourth generation) is a full-size automobile produced by Chevrolet for the 1965 through 1970 model years.The 1965 Impala was all new, while the 1967 and 1969 models featured new bodies on the same redesigned perimeter frame introduced on the 1965 models.
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.
Another popular service-parts-only component used on the 302 was the Option K66 T.I. Specialties magnetic-pulse Delco transistor-ignition ball bearing distributor. Introduced in 1963 on Pontiac's 389 and 421 cu in (6.4 and 6.9 L) drag racing engines, General Motors fitted it to the 1967 Z/28 before they used it on the L88 427 cu in (7.0 L ...
There were other major differences between the Turbo-Thrift engine and the Stovebolt: Bore spacing matches the Chevrolet small-block V8's 4.4 inches,; Stroke of the 194 and 230 engines is the same 3 + 1 ⁄ 4 in (82.6 mm) as the 327 small-block and 348 big-block V8s