It also made it’s way into the popular 1990-1993 Chevy 454 SS.
These engines were dubbed the L19 and were in a number of Chevy and GMC C/K trucks.
#1971 el camino ss 454 for sale update#
The first major update to the Chevrolet 7.4L big block engine came in 1987 with the switch to EFI. However, Chevy did also offer a 454 crate engine known as the LS7. LS4 and LS5 versions became the only production engine available in Chevy or GM vehicles. The LS6 was the more powerful variant but it was quickly phased out following 1971.
As such, the older 454 LS engines are not to be mistaken with the common LS engine family.Ĭhevrolet 454 big blocks were either LS4, LS5 or LS6 engines. It’s hard to go a day in the automotive world without hearing the comment, “just LS swap it.” The LS small block engine family didn’t come around until 1997, but Chevy was using the LS designation long before then. GM LS engines are without question some of the most popular V8 engines. In the next sections we’ll discuss a few of the primary variants of the 7.4L big block V8. Anyway, the point is that the Chevy 454 has been a prominent engine since its intro in 1970. The engine was much the same up until 1987 when Chevy added EFI. In ’79, GM got rid of the 454 option in the half-ton trucks but continued using it for heavy-duty truck applications. However, it was also used in Chevy and GMC trucks from 1973-1991. It’s certainly best known for its stretch in muscle cars of the early 70’s. Chevy 454 Big Block VariantsĬhevrolet 454 engines never really disappeared since 1970. We covered these topics in-depth in our Buick 455 engine guide, so check it out if you want to learn more. However, power ratings rapidly declined throughout the 1970’s due to lower compression, emissions laws, and SAE power measurements. Meanwhile, the LS6 in the Chevelle could deliver up to 450hp with the 4 barrel carb. The Chevrolet Corvette with the LS5 version delivered 390hp. Firing order for the Chevy 454 is 1-8-4-3-6-5-7-2.Įarly versions of the 7.4L V8 were able to deliver 360-450 horsepower and 500 lb-ft of torque. They also share the exact same displacement and bore x stroke of 4.25″ x 4.0″. Newer variants of the 454 use aluminum heads but share the same cast iron block. The block and heads are cast iron which delivers great strength, but also makes for a nearly 700 pound engine. As the name suggests, the Chevy 454 big block V8 delivers a 454 cid displacement – or 7.4 liters. It was Chevrolet’s second big block production motor following the Mark I W-series from the late 50’s to mid-60’s. The 454 engine is also known as the Mark IV or Mark IV Rat Motor. Again, our primary focus is the original 454 but we’ll circle back to the later variants including the currently available crate engine. Chevy 7.4L big blocks made their way back around in the mid to late 1990’s in the form of the Vortec 7400. This later version of the engine is the L19 and features electronic fuel injection (EFI). The Chevy big block is also popular in the 1990-1993 Chevy 454 SS truck.
Original 1970-1976 Chevrolet 454 engines are in the following years and models: As such, we will briefly discuss the various 454 ci engines from 1970 up to the modern crate engine. However, even the modern 454 HO crate engine shares the same general design. *Our primary focus in this article is the original 454 big block engine from 1970-1976. In this guide, we discuss Chevy 454 engine specs, performance, reliability, upgrades, and more. With over 50 years of history to unpack, the Chevy 454 7.4L V8 is an exciting engine that also offers tons of potential. It’s best known for its use in the 1970-1974 Corvette, but it’s also popular in the Caprice, Chevelle, and El Camino of the same era. The Chevrolet 454 big block was introduced in 1970 and is still available today as a crate engine.
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