The 1970 AMC Javelin SST is a rear-wheel-drive hardtop coupe powered by a selection of inline-6 and V-8 engines that feature additional optional features to differentiate it from standard Javelins. The 1970 SST model featured a unique large woodgrain dashboard that is one of this vehicle's most distinguishing features. A limited run of 2,501 Mark Donahue edition SSTs featuring a rear ducktail spoiler were also manufactured for racing homologation purposes.
The AMC Javelin SST was considered an upgrade package from the standard Javelin. However, in 1970, more than twice as many SST models were produced than base Javelins. Power for the 1970 Javelin was produced by a base inline-6 engine producing 145 or 155 peak horsepower, depending on carburetor configuration. The optional V-8 engine lineup consisted of a 5-liter V-8 producing 225 horsepower, a 5.9-liter engine producing 245 horsepower, or a 6.4-liter V-8 with a four-barrel carburetor producing 325 horsepower.
In addition to its distinctive interior design, the 1970 Javelin SST featured many exterior design changes such as expanded hood vents that visually distinguished it from older Javelins. Many of these changes were due to input from AMC's racing division, particularly Mark Donahue. Mark Donahue SST Javelins feature a decal with the racer's name, along with its distinctive rear spoiler.