General Motors 8.1L

Image of a General Motors 8.1L engine

Product Bulletin PDF Download

The GM 8.1L is a popular engine used in step van applications including parcel packages, bread, snacks, uniform/laundry, and other commercial delivery vehicles. The 8.1L engine is used in various industrial and construction work truck applications including various motorhome applications, Chevrolet/GMC 2500 – 3500 trucks, vans and SUV’s including the Silverado, Sierra, Suburban, Yukon, Avalanche, Express and the medium duty Chevrolet Kodiak.

Reviva uses OEM or equivalent pistons, rings, bearings, valves, gaskets and other components, making sure this engine will stand the test of time. The engine is dyno tested with the OEM GM ECM, specific to application, not the generic or modified to “get it close.”

All Reviva engines are assembled in the USA.

Block Configurations


Intake manifold, throttle body, fuel rail, injectors, water pump, spark plugs, ignition coils, thermostat and housing, vibration damper, sensors and much more!


Call toll-free 877-470-3524


All of Reviva’s Complete Drop-In engines are 100% dyno tested prior to shipment. Computer controls ensure that each engine dyno test is conducted under standard, repeatable settings. Every engine is run through a warm up cycle; three separate cruise segments simulating light, medium, and heavy throttle conditions; maximum torque and horsepower tests; and a black light leak detection test with dyed oil, coolant, and fuel.


Reviva warrants to the original buyer that every product will be free from proven defects in material and workmanship. Reviva warranty obligation will be limited, at our opinion, to repair or replace with another remanufactured engine. All warranty work must be preauthorized by Reviva. To activate the warranty, all engines must be registered within 30 days from shipment. Drop-In engines carry a full 2 year/unlimited mile warranty.

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Reviva is an independent manufacturer and is not affiliated with Ford or General Motors.