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The Generation III 5.7L (LS1 and LS6) engines share little other than similar displacement, external dimensions, and rod bearings, with its predecessor (LT1). It is an all-aluminum 5,665 cc (5.7 L; 345.7 cu in) pushrod engine with a bore and stroke of 99 mm × 92 mm (3.898 in × 3.622 in).
It was a slightly de-tuned version, with 7 kW (10 PS; 9 hp) less than when it was in the two-door sports body of the Corvette. Continuous modifications were made to the LS1 engine throughout its lifetime, reaching 285 kW (387 PS; 382 hp) in the YII series, just 15 kW (20 PS; 20 hp) under the 300 kW (408 PS; 402 hp) GTS.
The C4 Corvette represented a clean break from the Zora Arkus-Duntov-designed C3, with a completely new chassis and sleeker, more modern but still evolutionary styling.It was the work of a team under chief Corvette designer Dave McLellan, who'd taken over from Duntov in 1975 — under the design direction of Irv Rybicki.