The Chevrolet Targetmaster 350-cubic-inch V-8 engine was a replacement engine for pre-1986 Chevrolet vehicles. Chevy later renamed the Targetmaster the Goodwrench 350, which was part of General Motors' Goodwrench service/parts network. The Goodwrench program was scheduled to close in February 2011.
The Targetmaster 350 began production in 1981 in Mexico. It was a basic, no-frills engine that featured a one-piece rear main seal, which was characteristic of all pre-1986 Chevy small-block engines. The seal permitted Chevy owners to swap virtually any engine with Targetmaster without changing the flywheel or flexplate.
The Targetmaster 350, and later the Goodwrench 350, featured the same dimensions as the original 350 with a 4-inch cylinder bore and 3.48-inch stroke. The compression ratio, however, was lower than the 1960s versions at only 8.1:1-to-1. The low compression ratio allowed the Targetmaster to run on 87-octane fuel. The lower compression ratio also sapped the 350's power with a horsepower rating of 190. Torque was 250 foot-pounds. Independent testing reported the Targetmaster was capable of up to 238 horsepower and 324 foot-pounds of torque.
Chevy's Targetmaster was not a replacement engine for other General Motors vehicles, such as Buick, Pontiac and Oldsmobile. These cars featured 350 V-8s, but were not related to the Targetmaster/Goodwrench engines.
