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. If you would like to learn more about this vehicle, please contact at Legendary Motors LLC.The Chevrolet 454 big block was introduced in 1970 and is still available today as a crate engine. Please see below for a list of some of the major components and modifications done on this 1971 Chevrolet El Camino. Inside the car you will find a new interior complete with a horseshoe shifter and complement of SS gauges. It pulls hard and shifts smoothly through the gears with a great rumble from the dual exhaust. This 1971 El Camino SS Tribute features a 454 cubic inch motor mated to a TH400 3-speed automatic transmission. A clear definition of solvent pop is as follows: “When solvents are trapped throughout the refinish process, small bubbles or pinholes can form in the surface of the paint.” When you step a few feet away from the vehicle you will be hard pressed to find these areas. This paint on this El Camino presents very well, upon closer examination of the paint you will find areas of solvent pop. This El Camino is now finished in what is called an Antique Green Poly with white SS stripes. This 1971 Chevrolet El Camino SS Tribute was purchased at Barrett-Jackson Northeast in 2017 and went into a collection and was where it was driven very little. The 1971 El Camino trim was available in three levels including the base model El Camino, the El Camino Custom, and the El Camino SS454.” - Ground Up Single headlamps now sat in square headlamp extensions and the double stacked parking lamps were moved from the bumper to the front corners of the fenders and doubled as side markers. “The 1971 El Camino again sported an entirely new look from that of the previous year.
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