396 TURBO-JET (1965-69)
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| L-34 |
1966-67 |
Rated at 350hp and 360hp with Holley carburetor. |
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1968-69 |
Quadrajet carburetor came onboard. Cam: High-lift performance hydraulic. Heads: Oval intake ports. Compression ratio: 10.25:1. Crankshaft: Forged steel. Block: Mostly two-bolt main caps; some four-bolt main caps in early Chevelles. Can make 500 hp with big cam, intake, carb and headers. |
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| L-35 |
1965-69 |
325hp, smooth-idle, torque engine. Heads: Oval intake ports. Cam: Low-lift torque-type. Mostly Quadrajet carb, but some had a Holley. Crankshaft: Forged steel in ’66-’67 engines; nodular iron in ’68-’69. Compression: 10.25:1. Block: Two-bolt main bearing caps. Can make 500 hp with big cam, intake, carb and headers. |
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| L-66 |
1969 |
Rare two-barrel 396. Small-port heads; low-rpm torque engine; 9.0:1 compression; two-bolt main bearing caps; nodular-iron crankshaft. |
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| L-78 |
1965-69 |
375 hp in ’65 Chevelle with performance hydraulic camshaft; 425 hp in Corvette and big-car with solid lifter camshaft. Carb: 800cfm Holley. Heads: Large rectangle-type intake port; power to 7,200 rpm. Block: Four-bolt main bearing caps. Compression: 11.0:1/forged pistons. Crankshaft: forged steel/tuft-rided. |
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| L-89 |
1968-69 |
It is an L-78 with aluminum, closed-chamber heads. |
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402 TURBO-JET (1970-72)
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| L-34 |
1970 |
Same as 396, but with a 0.032-inch overbore. |
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| L-78 |
1970 |
Same as 396, but with a 0.032-inch overbore. |
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| LS3 |
1970-71: Same as L-35 396. Rated at 330 hp in 1970. 8.50:1 compression in 1971 dropped rated gross horsepower to 300. Block: Two-bolt main bearing caps. Crankshaft: Nodular iron. Camshaft: Low-lift hydraulic. |
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| LS3 |
1972 |
Rated at 240-net-hp with dual-exhaust system. Rated at 210-net-hp with single exhaust. |
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427 TURBO-JET (1966-69)
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| L-36 |
1966-69: Rated at 385 hp and 390 hp with different exhaust systems. Mostly Quadrajet carb, some Holley. Compression: 10.25:1. Heads: Oval intake ports. Camshaft: High-performance hydraulic. Block: Two-bolt main bearing caps. Forged steel crankshaft. |
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| L-68 |
1967-69Â Â Same as L-36, except for Holley tri-carb; two-barrel induction system on oval-port aluminum intake manifold. |
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| L-72 |
1966-68 |
Rated at 425 hp. Carb: 800cfm Holley on aluminum high-rise intake manifold with plenum divider. Camshaft: Solid lifter. Compression ratio: 11.0:1/forged pistons. Block: Four-bolt main bearing caps. Crankshaft: Forged steel, tuft-rided. Considered Chevy’s best Street big block due to its driveability and rev-ability. |
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| L-71 |
1967-69 |
Same as an L-72, except for Holley tri-carb; two-barrel induction system on rectangle-port aluminum intake manifold. |
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| L-89 |
1968 |
Same as L-71, except for aluminum, closed-chamber heads. |
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| L-88 |
1967-69 |
Factory race engine. Compression: 12.5:1/forged pistons with floating wrist pins. Camshaft: Ultra-radical solid lifter. Carburetor: 850cfm Holley. Said to have aluminum heads (open-chamber in 1969). Crankshaft: Forged steel, tuft-rided. Larger 7/16-inch-diameter pushrods. High-rise, open-plenum intake manifold. |
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| LS1 |
1969 |
Rated at 335 hp. Quadrajet carburetor. Oval-port heads, low-lift hydraulic camshaft. Compression: 10.25:1. Block: Two-bolt main bearing caps. Crankshaft: Nodular iron. |
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| ZL-1 |
It was a COPO, not RPO. |
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454 TURBO-JET
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| LS4 |
1970 |
Rated at 345 hp with Quadrajet carburetor. Camshaft: Low-lift hydraulic. Heads: Oval intake ports. Compression: 10.25:1. Block: Said to have four-bolt main bearing caps. Crankshaft: Said to be forged steel. |
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| LS4 |
1973-76 |
Rated from 270-net-hp to 215-net-hp in different chassis. Quadrajet carburetor. Low-lift hydraulic camshaft. Heads: Oval intake ports. Compression: 9.0:1. Block: Two-bolt main bearing caps. Crankshaft: Nodular iron. |
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| LS5 |
1970 |
Depending on chassis, rated at either 360 hp or 390 hp. Quadrajet carburetor. High-lift hydraulic camshaft. Heads: Oval intake ports. Compression: 10.25:1. Block: Four-bolt main bearing caps. Crankshaft: Forged steel. |
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| LS5 |
1971 |
Rated at 365 hp. Heads: Oval intake ports with open combustion chambers for less compression ratio (8.5:1). |
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| LS5 |
1972 |
Same as 1971, but rated at 270 hp with dual exhaust and 230 hp with single exhaust. |
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| LS6 |
1970 |
Officially rated at 450 hp. Compression: 11.0:1/forged pistons. High-lift, solid-lifter camshaft. Heads: Rectangle intake ports. Block: Four-bolt main bearing caps. Crankshaft: Forged steel, tuft-rided. Carburetor: 800cfm Holley. |
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| LS6 |
1971 |
Rated at 425 hp with iron open-chamber heads. Compression: 9.0:1. Otherwise, same as 1970 LS6. |
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