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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).
This engine was identical to the 425 hp (317 kW) L72 427 (first introduced in 1966), but was fitted with 3×2-barrel Holley carburetors, [31] known as "Tri-Power," in lieu of the L72's single 4-barrel carburetor. Both engines used the same high-lift, long-duration, high-overlap camshaft and large-port, cast-iron heads to maximize cylinder head ...
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).
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 ...
In 1967 the 421 was enlarged to 426.61 cu in (7.0 L) by increasing its bore to 4.12 in (104.6 mm). Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. It retained the 421's 4 in (101.6 mm) stroke and 3 + 1 ⁄ 4 in (82.6 mm) main journal.
Requests from dealers (notably Don Yenko in PA, Baldwin-Motion in NY, Nickey in IL and Dana in CA) who had been dealer-installing 427 cu in (7.0 L) engines in the Camaro prompted Chevrolet to use an ordering process usually used on fleet and special orders (taxis, trucks, etc.) to offer 427 engines in the Camaro. Two Central Office Production ...
The exception was the optional 425 hp (317 kW) 427 cu in (7.0 L) Turbo Jet V8 was no longer listed, leaving the 385 hp (287 kW) 427 as the top engine. The three-speed Turbo Hydramatic transmission that previously only available with the 396 cu in (6.5 L) and 427 cu in (7.0 L) V8s was now optional with the 275 hp (205 kW) 327 cu in (5.4 L) Turbo ...
The Chevrolet Chevy II/Nova is a small automobile manufactured by Chevrolet, and produced in five generations for the 1962 through 1979, and 1985 through 1988 model years. Built on the X-body platform, the Nova was the top selling model in the Chevy II lineup through 1968. The Chevy II nameplate was dropped after 1968, with Nova becoming the ...