exhaust. This was the most powerful in any AMC vehicle while retaining features required for normal street operations, as well as components to assure outstanding performance characteristics without incurring high-unit cost penalties. The engine is fed by a 690-cfm Motorcraft 4-barrel carburetor, and pumped up a 10.0:1 compression requiring high-octane gasoline. The Machine featured a large ram-air intake hood scoop that was painted Electric Blue (code B6) with a large tachometer visible to the driver integrated into a raised fairing at the rear of the scoop. This hood-mounted tach came from the same vendor as used on competing makes with only different dial faces. Early production hood scoops were fiberglass layups, while those installed on Machines after 1 January 1970 were injection molded and of higher quality. The heavy-duty suspension was augmented by station wagon springs in the rear (with a higher load rating) giving the car a raked look. Standard were a Borg-Warner T-10 four-speed manual transmission with a Hurst floor shifter backed by either 3.54:1 or 3.91:1 rear axle gear ratios in the "Twin-Grip" differential, as well as power disc brakes, wide E60x15 Goodyear Polyglas white letter tires mounted on "Machine" mag-styled steel x wheels, and a black interior with bucket seats and a center armrest upholstered in red, white, and blue vinyl. Machine wheels Among its standard performance features, all The Machine models included a special set of wheels with the appearance of a cast alloy wheel. Painted silver metal flake with a rough texture, they have a mag-style appearance. AMC described them as "15-inch styled road wheels" in brochures and catalogs. Enthusiasts call them "Machine wheels". They came with a chrome center cap adorned with a blue trim disc featuring a gear icon in the center and the words American Motors around it. The by wheels made by Kelsey-Hayes. They have five narrow cooling slots positioned atop risers stamped around the center of the wheel. The trim ring is unusual because it does not overlap the rim (to allow for attaching wheel balancing weights) and it is permanently press-fit. The "Machine" wheels were also optional on the 1970 AMX and Javelin models through the 1972 model year, as well as part of the "Go-Package" on 1971 and 1972 Javelin AMXs, after which a more conventional 15x7-inch slotted steel rally wheel replaced it. Marketing Advertisements in magazines such as Hot Rod teased that The Machine is not