The GM 8.1L Vortec engine was the last of the GM series of big block engines. This V8 engine replaced the 7.4L Vortec as the high power option for the vehicles in which it was offered. The bore was kept the same for the 8.1L engine, but the stroke was lengthened which provided the extra displacement. Some other changes included new firing order, re-designed intake ports, and a conversion to metric threads throughout the engine, which no doubt had a major impact to tools required at the manufacturing plants as well as for mechanics who work on this engine. 8.1L Vortec 8100 V8 Engine Specs L18 Displacement (cu in / cc): 496 / 8128 Horsepower: 330 hp @ 4200 RPM Torque: 450 lb.-ft. @ 3200 RPM Bore and Stroke (in / mm): 4.25 x 4.37 / 107.9 x 111 Compression Ratio: 9.1:1 Fuel Delivery: Sequential Fuel Injection Ignition System: Coil-Near-Plug, Platinum-Tipped Spark Plugs, Low-Resistance Spark Plug Wires Valvetrain: OHV Block Material: Cast Iron Cylinder Head Material: Cast Iron Emission Controls: 3-way Catalytic Converter, Exhaust Gas Recirculation, Positive Crankcase Ventilation, Evaporative Collection System The 8.1 L Vortec was offered a variety of platforms for GMC and Chevrolet. The Chevy versions that used this engine were the Silverado, Suburban, Express, Avalanche, and Kodiak, while GMC offered the engine in the Sierra and Yukon XL. Other specialty versions included the Workhorse motorhomes, T98 armored vehicles, and the 26 foot U-haul truck.
We are located just 10 minutes north of Cedar Rapids,Iowa just off Interstate 27(380) at Exit 35
