engine in the 1969–1974 Chevrolet Corvette. In 1969 and 1970 it was a version of the small-block, with 10.25:1 compression and hydraulic lifters. It used a Rochester "4MV" Quadra-Jet 4-barrel carburetor and a L48 camshaft. In 1971, power decreased to (gross) and (gross) of torque with a lower 8.5:1 compression. 1972 saw (net) and (net) of torque. In 1973 power decreased to , but increased slightly in 1974 to . Post-1971 blocks possibly had a lower nickel content but thicker cylinder deck, and post 1974 heads of the small block Chevrolet used less iron, and were lighter weight, crack-prone, and were less powerful because of the lower compression ratios used. LT-1 Years: 1970–1972 The LT-1 was one of the most well-known SBC V8s becoming available in 1970. It used solid lifters, 11.0:1 compression, the "178" high-performance camshaft, and a vacuum secondary Holley four-barrel carburetor on a special high-rise aluminum intake, with special 2.5" outlet rams' horn exhaust manifolds in the Corvette, Delco transistor ignition and a low-restriction exhaust factory rated at in the Corvette, and at 6000 rpm and at 4000 in the Camaro Z28 (the NHRA rated it at for classification purposes). Redline was 6,500 rpm but power fell off significantly past 6,200 rpm. The LT-1 was available in the Corvette and Camaro Z28. Power was down in 1971 to dual-rated (gross)/ (net) and of torque with 9.0:1 compression, and again in 1972 (the last year of the LT-1, now rated using net only, rather than gross, measurement) to and . L82 Years: 1973–1980 The 1973–1974 L82 was a "performance" version of the 350 that still used the casting number 624 76cc chamber "2.02" heads but with a Rochester Quadra-jet 4bbl carburetor and dual-plane aluminum intake manifold, the earlier L46 350 hydraulic-lifter cam, and 9.0:1 compression forged-aluminum pistons producing (1971 was the first year for SAE net hp rating, as installed in the vehicle with accessories and mufflers) and of torque. Its cast-aluminum LT-1 valvecovers were painted crinkle-black contrasting with the aluminum manifold and distributor housing. It was down to and of torque for 1975. It produced in the Corvette for 1976–1977. The 1978 L82 recovered somewhat, producing and in the Corvette and in 1979 it produced in the Corvette. In 1980, its final year, it produced a peak of . This engine was also available on the Chevrolet Camaro in 1973 and 1974. L81 Years: 1981 The L81