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In this guide, we discuss Chevy 454 engine specs, performance, reliability, upgrades, and more. *Our primary focus in this article is the original 454 big block engine from 1970-1976. However, even the modern 454 HO crate engine shares the same general design.
The Chevrolet "big-block" engine is a term for a series of large-displacement, naturally-aspirated, 90°, overhead valve, gasoline-powered, V8 engines; that were developed and produced by the Chevrolet Division of General Motors, from the 1950s until present.
Engine Specs for the Chevy 454 V8 such as horsepower and firing order.
Horsepower was 230 HP at 3600rpm and torque was 385 ft-lbs at a low 1600rpm. New for 1991 Mark V big block. Note the changes in the water jackets. Mark V’s require special head gaskets to use cylinder heads designed for other generations. In 1991 the new Mark V block was introduced.
454ci: Chevrolet added the 454 in 1970, with the same bore but slightly more stroke than the 427 at 4 inches. An LS7 version—not the modern LS model—offered in the Corvette and as a dealer...
Chevy 454 Engine Specs. The Chevy 454 uses a typical old-school V8 design like you’d find on small block engines like the Chevy 350 or Chevy 305. Though things like compression, fuel injection, and emissions systems have changed over the years, the basic 454 construction remains identical to the day it first came from Chevy.
Fifth-generation 454 big block Chevrolet engines produced from 1991 to 1995 feature improved designs for the rear main seal, oil passages, valve covers, and front covers.
As the 1970s progressed, the Chevy 454’s engine specs by year declined due to stricter emission laws and new SAE power standards. Initially boasting up to 450 hp, later models produced around 230 hp. Despite reduced power, the 454 maintained strong torque, necessary for heavy-duty applications.
The 454 EFI version was rated from 230 hp (170 kW) to 255 hp (190 kW) and from 385 lb·ft (522 N·m) to 405 lb·ft (549 N·m) of torque. The 7.4 L 454 EFI was found on GM 2500 and 3500 trucks throughout the early 1990s until replaced with the Vortec 7400 (GEN VI) in 1996.
In this article, we will delve into the specifications of the Chevy 454 Big Block engine, its engine configuration, and the engine oil specs and service intervals. The Chevy 454 Big Block engine is a V8 engine that belongs to the Chevrolet Mark IV engine family.