![]() ![]() 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 install this part on your vehicle and use the vehicle on a public road or highway, you will violate the Clean Air Act 203(a)(3), 42 U.S.C, 7522(a)(3) and may be subject to personal civil or criminal liability.The Chevrolet 454 big block was introduced in 1970 and is still available today as a crate engine. ![]() Once this part is installed, the vehicle may never be used, or registered or licensed for use, on a public road or highway. I understand: These products are manufactured and sold for installation on vehicles to be used solely for competition purposes. We recommend verifying with your local state emissions department prior to purchasing any products that may alter your vehicles emissions. have a variety of additional smog regulations depending on the state and county. Law enforcement may cite you for the use of an illegal aftermarket part and seize your title and license plate.Īdditional States: Different states throughout the U.S. Installation of parts which are not CARB approved on a pollution-controlled vehicle in the State of California may result in the Department of Motor Vehicles (DMV) revoking the vehicle registration and certificate of ownership (title), refusing the transfer of registration, and/or the vehicle failing smog inspection. WARNING: It is illegal to install any aftermarket part that alters or modifies the original design or performance of the motor vehicle pollution control system unless the part is exempted or has an Executive Order issued by the California Air Resources Board (also commonly referred to as the "EO" number). ![]()
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