Chevrolet Targetmaster Specifications


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.

Inexpensive Replacement

  • 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.

Other GM Cars

  • 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.

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