A 1967 Chevrolet Yenko Super Camaro 427/450 is up for auction.

Not all 1960s muscle cars came from the factory. This 1967 Chevrolet Yenko Super Camaro 427/450, which will be offered at the Barrett-Jackson auction on January 29 in Scottsdale, Arizona, is the product of an enterprising dealer.

At his dealership in Canonsburg, Pennsylvania, Don Yenko built cars that General Motors would not build. Shortly after the Camaro debuted as a 1967 model, Yenco decided to put a 427 cubic-inch V-8 under its hood. Besides this car, which was named the Jenko Super Camaro, Jenko also offered tuned versions of the Chevelle and Corvair

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The car offered at auction started out as a 1967 Camaro with the already rare L78 engine. It was one of only 1,138 cars to leave the factory powered by Chevrolet's 396 cubic-inch V-8 and backed by a Muncie close-ratio four-speed manual transmission.

However, Jenko upgraded it to a 427 cubic-inch L72 V-8, which boosted power from the stock 375 hp to 450 hp (hence the name 427/450). And while this Camaro was originally quite rare, it is one of only 54 documented 1967 Yenco Super Camaros, according to the listing.

In addition to the larger engine, Yenco added a heavy-duty clutch and pressure plate, and upgraded the cooling system and suspension. All for only $677.27 in 1967 dollars.

Barrett-Jackson did not list a pre-auction estimate of the price, but given the rarity of the car and the market's continued desire for classic muscle cars, it is expected to sell for a substantial sum. The Yenko name was recently used by New Jersey-based revived by Specialty Vehicle Engineering as a modern-tuned Chevrolet series with a maximum output of 1,050 hp, but that will not diminish the appeal of the original Yenko Camaro.