Chevrolet Corvette 1981 C3 – 383 / 500HP

A 383 stroker swap turns a Corvette’s stock 190-horsepower small-block into something that can push past 500 horsepower, all without changing the engine’s outward dimensions. This dark blue 1981 C3 – built during the brief window when Corvettes came from two factories at once – has clearly been transformed from its factory-carbureted origins. Upgraded suspension, transmission, and cooling round out a build meant to handle all that added power.

1981 Chevy Corvette C3 packing a nasty 383 stroker.. upgraded transmission, suspension, and cooling system. This car wears dark blue metallic paint and has restored leather interior and a 165 speedometer…

Nothing about the number stamped on this Corvette’s original build sheet matches what’s actually under its hood today. Somewhere along the way, its factory small-block gave way to a 383 stroker — a build that swaps in a longer-throw crankshaft to add real displacement without changing the engine’s outward dimensions. Depending on how it’s built, that swap can push output well past double what this Corvette’s original engine ever produced. Add an upgraded transmission, suspension, and cooling system, and this dark blue example has clearly moved a long way from the showroom car it started as. Just how much power is actually hiding under that hood now?

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From 190 Horsepower to Nearly Triple That

The stock 1981 Corvette used a carbureted 350-cubic-inch V8 with 8.2:1 compression, good for 190 horsepower — the last year a Corvette engine relied on a carburetor before fuel injection took over. A 383 stroker conversion starts by fitting a crankshaft designed for the larger 400-cubic-inch small-block into a 350 block, stretching the stroke from 3.48 inches to 3.75 inches, and depending on the heads, cam, and induction chosen, finished combinations commonly land anywhere from 400 to well over 500 horsepower — squarely in the range this car’s 500-horsepower claim suggests.

A Car Caught Between Two Corvette Eras

The 1981 model year holds an odd distinction in Corvette history: it was the last year buyers could order a manual transmission until the C4 revived the option in late 1984, and 1981 was also the only year Corvettes came from two different factories simultaneously, as the new Bowling Green, Kentucky plant built its first car in June while the old St. Louis plant finished out its final production run. A restored leather interior and a 165-mph speedometer on this particular car nod to Corvette’s performance image, even if the factory speedometer’s ambitions rarely matched what the base engine could actually deliver.

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