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The engine was available through mid-1965, when it was replaced by the 396 cu in (6.5 L) 375 hp (280 kW) Mark IV big-block engine. In addition, a 340 hp (254 kW) version of the 409 engine was available from 1963 to 1965, with a single 4-barrel cast iron intake mounting a Rochester 4GC square-bore carburetor, and a hydraulic-lifter camshaft.
The block entered production in mid 1965 as the Mark IV 396 cu in (6.5 L) "Turbo-Jet," phasing out the first-generation W-series Big-Block. In its first year the 396 was available as the L78 option in Corvettes and full-sized (Impala, Bel Air, Biscayne) models, and as the L37 in the intermediate model.
Chevrolet's second generation big-block, the Mark IV had been introduced in 1965 in two 396 cu in (6.5 L) versions. In 1966 Chevrolet added a 427 cu in (7.0 L) version that was available exclusively in the sports car (Corvette) and full-sized (Impala, Bel Air, Biscayne) lines. While a 396 was still available in full-sized cars, the L72 and the ...
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 ...
A 396 cubic-inch V8 became an option (the first time a large-block V8 was offered in a light-duty GM truck). [14] For 1969, Chevrolet enlarged the 327 V8 to 350 cubic inches. For 1970, GMC phased its V6 engines out of light trucks, switching entirely to Chevrolet-produced engines.
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).
Power and performance were reduced. Engine offerings for 1971 included the 250-6, small-block V8s of 307 and 350 cubic inches; and big block V8s of 402 and 454-cubic-inch displacements. Horsepower ratings of those engines for 1971 ranged from 145 for the six to 365 for the RPO LS5 454 – all in gross figures. The LS6 454 V8 was gone forever.
The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the 400 cu in (6.6 L) and the 455 cu in (7.5 L) big blocks used a stroke of 4.25 in (108 mm), with crankshaft material changed to cast iron except in a few rare cases.
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