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The L81 was the only 5.7 L (350 cu in) Corvette engine for 1981. It produced 190 hp (142 kW) and 280 lb⋅ft (380 N⋅m) of torque from 8.2:1 compression, exactly the same as the 1980 L48, but added hotter cam and computer control spark advance, replacing the vacuum advance. [22] The L81 was the first Corvette engine to employ a "smart carburetor."
In 1971, the compression ratio was decreased to 9.0:1 and horsepower decreased to 330 hp (246 kW), then the same in Corvette and Camaro. A net horsepower rating of 275 hp (205 kW) was also given. In 1972, the rating decreased again, then to a net of 255 hp (190 kW). Gross horsepower was not given in 1972. In 1970, a Nova could also be ordered ...
The 350 cu in (5.7 L) base engine (ZQ3) remained at 300 hp (224 kW) and the L46 was again offered as a 350 hp (261 kW) high performance upgrade. New was the LT1, a 350 cu in (5.7 L) small-block V8 engine delivering a factory rated 370 hp (276 kW).
However, the C4's performance was hampered by its L98 250 hp (186 kW) engine until 1992, [7] when the second-generation Chevy small block, the 300 hp (224 kW) LT1, was introduced, markedly improving the C4's performance. 1996 was a high point of small block engines development and the 330 hp (246 kW) LT4 was introduced in all six-speed manual ...
It was rated at 350 hp (261 kW) and 440 lb⋅ft (597 N⋅m) of torque with a Rochester 4-barrel, and 360 hp (268 kW) with the L69 tri 2-barrel option in 1966. A nominal 360 hp was claimed in 1967 when equipped with a W30 camshaft, 4-barrel, and outside air induction, 502 of which were factory produced.
When introduced in the 1997 Corvette, the LS1 was rated at 345 hp (257 kW) at 5,600 rpm and 350 lb⋅ft (475 N⋅m) at 4,400 rpm. After improvements to the intake and exhaust manifolds in 2001, the rating improved to 350 hp (261 kW) and 365 lb⋅ft (495 N⋅m) (375 lb⋅ft (508 N⋅m) for manual-transmission Corvettes.