The Chevy Chevelle debuted for the 1964 model year. Taken from either Hebrew or French, Chevelle is said to mean “beautiful and bold.” Aimed at the Ford Fairlane, the Chevelle was built on GM’s new mid-size A-body platform. It rapidly became one of Chevrolet’s best sellers. As it evolved throughout the 1960s, the V8 powered two-door coupe and convertible Chevelles would emerge as heavy hitters in the muscle car wars.
The 1970 model year would be the pinnacle for power in GM muscle cars. Government fuel economy and emissions regulations, combined with insurance companies’ reluctance to cover young drivers in increasingly high-powered cars, marked the end for big-horsepower factory specials. Rather than quietly exit the muscle car stage, GM removed their rule limiting displacement on mid-size passenger cars to 400 cubic inches, and let each division go for broke. Chevy stuffed Chevelles full of Big Block goodness in the form of the 454 cubic-inch LS5 and LS6.
The Chevy Chevelle LS5 was a beast, to be sure. The 454 Big Block was underrated at 360 horsepower, with 500 pound-feet of torque. But the Godzilla powerplant was the LS6. The same displacement as the LS5, the LS6 was rated at 450 horsepower and 510 pound-feet of torque. Those in the know claimed 500 ponies was a more accurate figure. The LS6 had an iron block, 11.25 compression, solid lifters, a radical cam, and a Holley 800 CFM carburetor sitting atop a Winters aluminum intake. The LS6 could be paired with either a three-speed Hydramatic automatic or four-speed Muncie manual transmission.
Our feature 1970 Chevy Chevelle SS LS6 convertible has had a frame-off restoration. Finished in Fathom Blue with white SS stripes and white vinyl convertible top over a Parchment vinyl interior, it is powered by the 454 cubic-inch Big Block V8 producing 450 (likely more) horsepower. The monstrous LS6 moves power to the rear wheels with a Muncie M22 “Rockcrusher” close-ratio four-speed manual. The Chevelle is equipped with power steering, power brakes, pushbutton AM/FM/eight-track stereo, and tilt steering column. It rolls on SS wheels wrapped in Goodyear PolyGlass raised white-letter bias-plies. According to the Chevrolet SS Muscle Car Red Book, only 4,475 Chevelle LS6 coupes and convertibles were built in 1970.
This rare Chevy Chevelle SS LS6 convertible will cross the Mecum Auctions block at their Indy Fall Special event taking place October 5th through the 7th.