The 7.4-liter engine is known as the General Motors 7400, which was a Vortec-designated engine built from 1996 until 2001 as a truck engine. Vortec technology was first introduced by GM in 1986 in a V-6, 4.3-liter engine called the 4300. The word “vortec” comes from the word vortex. The idea was to create a fuel-efficient engine that incorporated an air-to-fuel combustion system which would ultimately increases horsepower. GM returned to big-block engine style, with the 454-cubic inch size, in search of power.
The 454 and the 7400
The muscle car era was long gone when the 7400 series was developed. The Vortec 7400 was based on the 1995 version of the 7.4 liter Chevy 454-cubic inch V8 big block that was rated at 230 horsepower. The Vortec version increased horsepower by 60 horsepower for the GM line of trucks. The 7400 refers to the engine size in cubic centimeters and this easily translates into 7.4 liters. This engine series ran from 1996 to 2001 in Chevy and GMC heavy duty line of trucks like the Chevy and GMC Suburban. The 7400 series was retired in 2001.