Chevrolet Corvette 2017 Yenko is the New KING of Horsepower

Chevrolet’s own factory-fastest Corvette made 650 horsepower and already felt like it was testing the limits of a street car. Then a tuner took the lesser Grand Sport, stroked it from 6.2 to 6.8 liters, bolted on a supercharger and reached roughly 800 horsepower and 750 lb-ft, wearing a badge that has been frightening Chevrolet rivals since the 1960s. Only a small number were ever built. Read on for what the Yenko/SC package actually changes and where that name came from.

Chevrolet’s own factory-fastest Corvette at the time, the Z06, made 650 horsepower and already felt like it was probing the outer limits of what a production car could reasonably deploy on a public road. So what happens when a specialist takes the supposedly lesser Grand Sport model, the naturally aspirated one that sits below the Z06 in the hierarchy, and pushes it to roughly 800 horsepower using a badge that has been unsettling Chevrolet’s rivals since the late 1960s? The answer arrived in early 2017 with a build sheet that reads like a factory hot rod taken several steps past reasonable, and only a small number of buyers would ever get the chance to order one.

Nearly Doubling the Grand Sport’s Output

The stock Grand Sport Corvette produces 460 horsepower and 465 lb-ft of torque from its naturally aspirated LT1 V8, which is already a serious output for a car positioned as the handling-focused middle of the Corvette range. The Yenko/SC package pushes that to roughly 800 horsepower at around 6,200 rpm and 750 lb-ft of torque near 4,200 rpm. That is not a tune and a cold air intake. It is a near-doubling of output that required rebuilding the engine’s bottom end, and it lands the Grand Sport comfortably above the supercharged Z06 that sat directly above it in Chevrolet’s own catalog.

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The Stroker Kit That Gets You to 6.8 Liters

Getting there started with displacement. The package uses a stroker kit that grows the engine from 6.2 to 6.8 liters, along with a stronger forged crankshaft, H-beam connecting rods and new pistons capable of surviving boost. A supercharger sits on top of that revised short block. The choice to add displacement before adding boost is the interesting engineering decision here, because it means the engine makes its power with less reliance on extreme boost pressure, which generally translates to better drivability, less heat soak and a torque curve that arrives earlier and stays flatter than a smaller forced-induction engine of similar peak output.

Z06 Parts Feeding a Car That Is Not a Z06

Feeding an engine making 800 horsepower requires fuel system hardware the Grand Sport never came with, so the package sources its fuel system components and injectors directly from the Z06. That is a neat solution: rather than engineering bespoke parts, the build borrows validated General Motors components from the car above it in the range, which helps with reliability, parts availability and long-term serviceability. It also produces a slightly surreal result, a Grand Sport with Z06 fuel hardware making considerably more power than the Z06 those parts were designed for.

Who Don Yenko Actually Was

The Yenko name carries genuine weight rather than being a marketing revival of a forgotten badge. Don Yenko ran a Chevrolet dealership in Canonsburg, Pennsylvania, and in the 1960s he began building cars that Chevrolet’s own corporate policy would not permit. General Motors capped intermediate-sized cars at 400 cubic inches, so Yenko pulled the 427 out of the Corvette parts bin and installed it in Camaros and Chevelles at the dealership, then sold them with a warranty. Those cars are among the most valuable American vehicles of the era today, and the practice eventually pushed Chevrolet into offering the Central Office Production Order route that made factory 427 Camaros possible.

How a 1960s Dealer Badge Came Back

The modern revival came through Specialty Vehicle Engineering, which holds the rights to the Yenko name and builds these packages for sale through Chevrolet dealers, meaning a buyer orders the car through normal dealer channels rather than shipping a finished Corvette off to a tuner. That distinction matters for warranty, financing and resale, and it mirrors what Don Yenko himself was doing fifty years earlier. The continuity is not accidental. The entire proposition rests on the idea that a dealer-delivered, warrantied, radically overpowered Chevrolet is a specific American tradition rather than an aftermarket modification.

What the Premium Actually Bought

The build carried roughly a $46,000 premium over the Grand Sport’s $66,445 base price, which put the finished car near six figures before options. That is a substantial ask, and the comparison buyers had to make was not against a stock Grand Sport but against a Z06, which cost less and came with a full factory warranty on the powertrain. What the Yenko offered in exchange was 150 more horsepower than the Z06, a considerably rarer car, and a badge with real collector history behind it. Whether that trade made sense depended almost entirely on whether the buyer intended to drive it or keep it.

Manual or Automatic, Coupe or Convertible

The package was offered in coupe or convertible form and with either the seven-speed manual or the eight-speed automatic, which is a broader set of choices than most low-volume performance packages allow. The manual coupe is the configuration collectors have gravitated toward, for predictable reasons. Manual transmissions in high-output cars have become genuinely scarce, and a seven-speed manual behind an 800-horsepower supercharged stroker V8 is the kind of specification that simply will not be offered again.

A Limited Build and a Collector Bet

Production was strictly limited, and that scarcity is the whole collector argument. A modern Corvette built in small numbers, carrying a name tied to some of the most valuable muscle cars ever made, sold through official dealer channels with documentation, is exactly the profile that tends to appreciate rather than depreciate. The risk is the one that attaches to every tuner-built modern car: the market has to keep believing the badge means something. Given what original Yenko Camaros and Chevelles trade for today, and given how few modern cars will ever combine a manual transmission, a naturally aspirated architecture converted to boost, and a name with half a century of documented history behind it, that bet looks reasonably well placed. The cars that appreciate are almost always the ones that could not be built again under current regulations, and an 800-horsepower dealer-delivered Corvette with a seven-speed stick belongs firmly in that category.

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