The 1970 Chevrolet Chevelle SS offered two different trim levels, the Z15 and Z25. The Chevelle SS models gave drivers two different choices of engines. The engine size was increased slightly from previous models, and some enhancements were also made to the interior.The Z25 serves as the base model SS, while the faster Z15 features more horsepower and a larger engine.
The Z25 SS-396 model was equipped with a 402 cubic-inch motor with 350 horsepower. The higher end Z15 SS-454 gave buyers two engine options, a 360 horsepower option and a 450 horsepower option. The SS-454 450-horsepower motor has since become one of the most famed and powerful engines in American muscle car history. Also known as the LS4 engine, Chevrolet went on to install it in its Corvette line.
The 1970 model also saw changes to the dash design. For the first model year, the Chevelle SS received its own interior dashboard design that was distinct from the base model Chevelle. The SS dash design provides more utility to the driver by locating all components to the left of the transmission tunnel and using cockpit-style gauges. The SS also began to receive "SS/396" and "SS/454" badges for each of its respective models.
The exterior of the Chevelle also changed slightly in 1970 with the addition of a large bulge to the hood. While the addition was applied to all Chevelle SS models, it was a structural necessity for the LS4-equipped SS-454, which needed added engine bay space to accommodate the larger motor. Hood pins were also added to the hood as standard equipment. Optional exterior enhancements included an induction cowl and hood stripes. The 1970 model shared the same wheels as its 1969 predecessor, a deep-dish five-spoke design.
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