![]() The 元4, 元5, and L78 continued to be available in 1970. The power ratings were unchanged from those of the 1969 396. This was done during the 1969 model year, thus both 396 and 402 cubic inch big-blocks were fitted that year. Increasing the 396's bore to 4.125", resulted in the 402 cubic inch engine. It used the two-bolt-main engine block, small-port, small-valve cylinder heads, 10.25:1 compression ratio, hydraulic camshaft, and cast-iron intake manifold with a Rochester Quadrajet carburetor. There was another 427 that is far less known - the 1969 LS1. The ZL1, available only during 1969 on the Corvette and Camaro, was an all-aluminum 427 cubic inch engine. ![]() It came with an aluminum high-rise intake manifold and a Holley 850-cfm carburetor. It had all the L72 components plus aluminum cylinder heads. The most powerful 427 cubic inch V-8 was the L88 - though it was rated at 430 HP. The L89 was the L71 engine equipped with aluminum cylinder heads. It was similar to the 425 HP L72 engine, but it used the Tri-Power intake setup instead of a single four-barrel carburetor. Also available on the 1967-1969 Corvette was the L71 427 cubic inch V-8. It was basically an 元6 engine with a Tri-Power intake setup. The L68 version was optional on Corvettes from 1967 to 1969. From 1967-1969 it was available in full-size cars. The L72 was available in the Corvette only in 1966. The L72 had a four-bolt-main engine block, forged crankshaft, large-port, large-valve cylinder heads, 11.0:1 compression ratio, solid-lifter camshaft, and an aluminum intake manifold with a Holley four-barrel carburetor. In 1966 the more powerful option L72 was released. The same engine, but rated at 5 HP less, was used on the full-size car line during 1967-1968, but returned to the 390 HP rating for 1969. The 元6 continued on the Corvette through the 1969 model year. The standard 427 was designated 元6 and it used the two-bolt main-bearing block, forged steel crankshaft, hydraulic camshaft, small-port, small-valve cylinder heads, 10.25:1 compression ratio, with a cast-iron intake manifold (1969 Corvettes received an aluminum unit), and it was fitted with a Rochester Quadrajet carburetor. The 427 had a bore and stroke of 4.251" x 3.76". The first Mark IV 427 cubic inch engine was delivered on the Corvette and the Chevrolet full-size car line. It was strictly low-performance as it was fitted with a two-barrel carburetor and made 265 HP. 1969 LS3. The LS3 396 was optional on the 1969 full-size car line.It had a two-bolt-main engine block, a cast-iron crankshaft, small-port cylinder heads, 10.25:1 compression ratio, a hydraulic-lifter camshaft, and cast-iron intake manifold with a Rochester Quadrajet carburetor. From 1967 to 1969 the 元4 was rated at 360 HP at the same rpm. It featured a higher lift hydraulic-lifter camshaft, cast-iron intake manifold, and Holley four-barrel carburetor. 1966-69 元4 396.In 1966, the medium-performance 元4 396 cubic inch engine still was equipped with the four-bolt-main block, however a cast-iron crankshaft, smaller-port cylinder heads, and 10.25:1 compression ratio pistons.It utilized a four-bolt-main engine block, forged-steel crankshaft, a solid lifter camshaft, and an aluminum high-rise-type intake manifold with a Holley four-barrel carburetor, rated at 375 HP. It came with the large-port cylinder heads, with 2.19" intake and 1.72" exhaust valves, and 11.0:1 compression ratio. The L78 was essentially the Corvette's introductory big block. The same engine, as installed in the Z16 Chevelle, was rated at 375 HP, the only change was that it was equipped with a hydraulic-lifter camshaft. All L78s produced during 1966-1969 used a solid-lifter camshaft. It utilized a four-bolt-main engine block, forged-steel crankshaft, a solid-lifter camshaft, and an aluminum high-rise-type intake manifold with a Holley four-barrel carburetor. The L78 came with the large-port cylinder heads, with 2.19" intake and 1.72" exhaust valves, and 11.0:1 compression ratio. It was designated as option L78, and it was rated at 425 HP at 6,400 rpm, with 415 foot-pounds of torque at 4,000 rpm. ![]() The first 396 was available in the 1965 Corvette. The 396 cubic inch version of the big-block was available from 1965-1969. By Wild About Cars staff, reprint with permission only
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