For 58 of its 60 years, the Chevrolet Corvette has been powered by the legendary Chevrolet V-8 engine. Technological advancements have increased output threefold – from 195 hp in 1955 to 638 hp today – as well as reliability, refinement and efficiency.
However, the fundamental architecture of the Chevrolet “Small Block” remains the same today as it was in 1955: a 90-degree V-8, with overhead valves actuated by pushrods, and a 4.4-inch on-center bore spacing.
“The brilliance of the Chevrolet V-8 is its elegant, efficient design,” said Jordan Lee, global chief engineer for Small Block Engines. “The Chevy V-8 has fewer reciprocating parts, and is very efficient and has one of the best power-to-weight ratios of any engine family in the industry. The design is incredibly compact, enabling the Corvette’s signature sleek profile and low hood line.”
Immediately after the V-8 was introduced, the small-block began a steady march upward in displacement, power and technological advancement.
The Corvette’s first 4.3L (265 cu. in.) small-block engine in 1955 produced up to 195 hp with an optional four-barrel carburetor. Today, the LS9 6.2L (376 cu. in.) supercharged small-block in the Corvette ZR1 is rated at 638 hp (476 kW), delivering about 230 percent more power than the original small-block engine from only 42 percent greater displacement.
Today’s small-block is also remarkably fuel efficient. For example, the 430-horsepower (476 kW) LS3 version of the Gen-IV small-block helps the 2013 Corvette accelerate from 0 to 60 mph in about four seconds, run the quarter-mile in just more than 12 seconds and achieve a top speed of 190 mph – all while achieving EPA-estimated highway fuel economy of 26 mpg.
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