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375–425 hp (280–317 kW) The L78 was a Big-Block engine produced by Chevrolet between 1965 and 1970. Rated at 425 hp (317 kW) for its first year, the rating dropped to 375 hp (280 kW) in subsequent years (although there was no change in power).
The engines included three 396 cu in (6.5 L) V8s – the standard, rated at 325 hp (242 kW), an optional 360 hp (270 kW), and an optional 375 hp (280 kW) (the mid-horsepower 396 was rated at 360 hp (270 kW) for 1966 and 350 hp (260 kW) thereafter). The SS 396 series lasted from 1966 through 1968 before being relegated to an option package in 1969.
The Chevrolet big-block engine is a term for a series of large-displacement, naturally-aspirated, 90°, overhead valve, gasoline-powered, V8 engines; that were developed and produced by the Chevrolet Division of General Motors, from the 1950s until present.
A high-performance 327 cu in (5.4 L) variant followed, turning out as much as 375 hp (280 kW) (SAE gross power, not SAE net power or the current SAE certified power values) and raising horsepower per cubic inch to 1.15 hp (0.86 kW). From 1954 to 1974, the small-block engine was known as the "Turbo-Fire" or "High Torque" V8.
For the first time, the Chevrolet 350 V8 was used in an El Camino. The Super Sport group included a 265 or 325 hp (198 or 242 kW) 396-cubic-inch V8 beneath a double-domed hood, along with a black-out grille displaying an SS emblem. More potent editions of the 396 engine, developing 350 or 375 hp (261 or 280 kW) also made the options list.
The 1968 Yenko Super Camaros started life as Super Sports with L78 396 in³ 375 hp (280 kW) hp engine and close ratio 4-speed Muncie transmission. Yenko also ordered the cars with COPO 9737 which included a 140 mph (230 km/h) speedometer, a larger 1 1/8th inch front anti-sway bar, and a special trim tag.
A 396 cu in (6.5 L) producing 350 hp (261 kW) at 5200 rpm and 415 lb⋅ft (563 N⋅m) of torque at 3400 rpm big block engine was added as an option for the SS, [20] and the Z/28 appeared in Camaro brochures, and nearly 7,200 were sold. The 427 cu in (7.0 L) was not available as a Regular Production Option (RPO).
The 1970 Camaro SS 396 had the big block 396 cu in (6.5 L) L78 rated at 350 hp (261 kW). Starting in 1970, the nominal "396" actually displaced 402 cu in (6.6 L), yet Chevrolet chose to retain the 396 badging , equipped with a single 4-barrel Holley carburetor that produced 375 bhp (380 PS; 280 kW) at 5,600 rpm and 415 lb⋅ft (563 N⋅m) at ...