A 1966 Chevelle badged ‘SS 496’ is showing off a number Chevrolet never actually offered that year — the factory topped out at a 396, and only 3,100 of the hottest version were built. The 496 under this one’s hood tells a different story: a modern stroker build chasing more power than even Chevy’s rarest big-block ever delivered.
That’s a nice looking Chevy!
No 1966 Chevelle ever left a Chevrolet factory with a 496 under the hood — that number didn’t exist yet on Chevy’s big-block order sheet. So a car wearing an ‘SS 496’ badge is either a mislabel, or it’s something more interesting: a modern engine swap wearing a nameplate that predates the technology inside it. Figuring out which one this is means understanding just how far the factory 396 actually went in 1966, and why builders decades later decided even that wasn’t enough.
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What Actually Came From the Factory in 1966
1966 was the first year Chevrolet made the 396 cubic-inch big block standard across every Chevelle SS, available in three states of tune: a base 325-horsepower version, an L34 option bumped to 360 horsepower with a taller cam and stronger block, and the rare spring-release L78, which borrowed the 427’s big-valve heads, 11.0:1 compression, and an 800-cfm Holley to reach 375 horsepower. Only about 3,100 L78s were ever built, making it the single hottest factory Chevelle of the year.
Where the ‘496’ Actually Comes From
A genuine 496 cubic inches means starting with a later 454 big-block, boring the cylinders and stroking the crankshaft well beyond factory spec — a build that didn’t exist as a factory option in 1966 and only became common decades later once aftermarket stroker kits made it practical. Dropping one into a Chevelle SS is a popular modern build precisely because the bigger displacement outperforms even the rare 375-horsepower L78 by a wide margin, without straying too far from the car’s original big-block identity.
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