1991 Chevy 454 Specs

by Monty Dayton
itstillruns article image
Kim Steele/Digital Vision/Getty Images

Several different big truck engines wore the designation "454" throughout the Chevy company's history. The first engine to wear the 454 designation was 1970, and many models produced in subsequent years would be based around those initial designs. The 1991 version of the Chevy 454 displayed several major changes to the old engine design that set it apart from all earlier Chevy engines also labeled 454.

Engine Layout

The 454 engine block appears in a very distinctive "V" shape with a row of cylinders on both sides. These cylinders make a 90-degree angle that is easy to see at a glance. The 1991 model includes a crank shaft that uses a one piece seal as opposed to the original two-piece design used by all previous 454 engines. This V8 fuel injected engine not only served as an upgrade from previous 454 models, but also as the base for future Chevy heavy engines that would eventually replace the 454.

Generation Five

The Generation Five, called Gen V by Chevy's marketing team, is the name given to the 1991 Chevy 454 engine. The new name came because of changes made to the engine to "modernize" it. In many ways the Gen V looks very similar to earlier 454 designs, but key differences set them apart. First of all, the adjustable valvetrain older models sported was eliminated on the Gen V. Oil passage designs were modernized and the location of other fluid containers were moved to modernize the design. Other minor modifications were made to the engine block itself in an effort to cut down on modern production expenses and make repairs easier.

Performance Specs

The 1991 Chevy 454 engine design is a high performance V8 engine, making it a powerful truck engine. The 7.4-liter engine uses fuel injection for maximum performance, and gasoline is the fuel of choice for this particular engine. Most new 454 engines from this year were released with a seven-year or 100,000-mile warranty, and these engines are also popular with many truck fans because they lend themselves to enhancements fairly easily for those people who need a little extra power or performance out of their vehicle.

More Articles

article divider