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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 was Regular Production Option Z24, marketed as the SS 427. This package was available on any 1967–69 2-door Impala and it included Chevrolet's 427 cubic inch V8, F41 Sport Suspension, redline tires, and unique SS 427 badges on the body. "SS427" badges were also installed in the interior of the 1968 model only.
In 1969, the Impala SS was available only as the Z24 (SS427), coming exclusively with a 427 cu in (7.0 L) V8 of 335 hp (250 kW; 340 PS), 390 hp (291 kW; 395 PS), or 425 hp (317 kW; 431 PS). This was the final year for the Impala SS until 1994.
The first Chevrolet to carry the "SS" badge was based on the Corvette C1 of 1956 (pictured) In December 1956, Chevrolet unveiled a show car based on the first generation Corvette called the Corvette Super Sport. In early 1957, the Chevrolet Corvette SS debuted — a custom built racing sports car that was the first Chevrolet to wear the SS badge.
1969 Chevrolet 302 cu in Z/28 engine showing factory cowl-induction system In 1966, General Motors designed a special 302 cu in (4.9 L) engine for the production Z/28 Camaro in order for it to meet the Sports Car Club of America ( SCCA ) Trans-Am Series road racing rules limiting engine displacement to 305 cu in (5.0 L) from 1967 to 1969.
This was so named because it began with Chevrolet's V8 engines. Chevrolet big-block V8s; Chevrolet small-block V8s; GM Vortec 4300 90° V6; GM Iron Duke RWD inline 4 (early RWD Variants, later versions may use a FWD pattern, and have two possible starter locations) Jeep with GM Iron Duke inline 4 2.5L/151 in 3 (1980-1983).
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 1967 Chevrolet Biscayne 2-door sedan with a 427 under the hood and a 3-speed manual did 0-60 mph in 6.1 seconds, and the quarter mile in 14.6 seconds. A base model 2-door Biscayne would cost you $2,472 (the Impala was $2,728) in 1965. In 1970 a base model Biscayne would cost $2,897 (the Impala was $3,150).