The Chevrolet 1500 is a series of light duty trucks produced under the names Silverado and Sierra. The 1500 comes in 3 different cab lengths, the 2 door, the 2 and 3 door extended cab and the 4 door crew cab.
The Chevy 1500 engine is actually the General Motors engine, Vortec and is manufactured in 4 different sizes. The smaller Vortec 4300 V6 engine is available in the regular cab only and is the smallest of the line.
The Silverado SS in a high performance version of the Chevy 1500 with upgrades in the interior and exterior appearances. In 2003, the Chevrolet Silverado SS was introduced with a much larger V8 engine, the 6.0l Vortec 6000 which has an output of 300 horsepower.