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The 1967 & 1968 427 Camaros were so popular that, in 1969, Yenko used Chevrolet's Central Office Production Order (COPO) system to have L-72 engines installed into Chevrolet Camaros and Chevelles. During 1971 and 1972, Yenko sold Yenko Stinger Vegas.
At the time, the largest engine installed in Chevelle SSs was the 396 V8. Yenko used the Central Office Production Order system, which usually filled special-equipment fleet orders, to create a special COPO 9562 that included the L72 427 cu in (7.0 L) with a single, four-barrel 800 CFM Holley carburetor that produced 425 bhp (431 PS; 317 kW) at ...
The L78 was a Big-Block engine produced by Chevrolet between 1965 and 1970. Rated at 425 hp (317 kW) for its first year, the rating dropped to 375 hp (280 kW) in subsequent years (although there was no change in power).
The L72 was a 427 cu in (7.0 L) 90° overhead valve V8 big-block engine produced by Chevrolet between 1966 and 1969. Initially rated at 450 horsepower, the rating dropped to 425 hp (317 kW) shortly after its release (although there was no change in power).
Yenko ordered L78 equipped SS Camaros and swapped in the Chevrolet Corvette's L72 427 in³ (7.0 L) V8. The cars came with a 4.10 rear end and heavy-duty suspension. The approximate number of cars produced is 54. Yenko also installed a fiberglass replacement hood similar to the "Stinger" hood featured on 1967 big-block Corvettes.
Yenko ordered 201 of these cars to convert them into Yenko Camaros. [27] Other dealers also became aware of the L72 engine package. Around 1,000 Camaros were fitted with the L72 engine option. [28] [29] The COPO 9560 used an all-aluminum ZL1 designed specifically for drag racing, where weight savings were at an absolute premium.
One of his notable products was the ZL-1 engine, which he produced under permission from Chevrolet. In 1981, Yenko made his last modification, the Turbo Z Camaro. He added a turbocharger to 350 in 3 (5.7 L) engine. In addition to Chevrolet, Yenko dealerships included Porsche, Audi, Fiat, Honda, Subaru and Saab.
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