The 8.1L features a large bore and stroke with an almost square bore-to-stroke proportion and a redline of approximately 5000 rpm. Actually, this motor was produced till 2009 for diverse motorhomes and ships. ![]() ![]() Finally, the power increases to 320-340 hp at 4200 rpm.Īlong with Chevrolet and GMC vehicles, this motor was also utilized for Kodiak, vessels and motorhomes. That’s a range of 2600 rpm of usable torque higher than 400 lb/ft, peaking at 440-455 lb/ft (depending on the year of production) at 3200 rpm. Advertisementīeing a gas motor, the 8.1L demonstrates an imposingly flat torque curve, being powerful at 1200-1400 rpm and finally coming to nought below 400 lb/ft after 4000 rpm. GM created these motors for pickups to work steadily for a long time. ![]() In 2007, a smaller but more high-performance 6.0L V8 substituted it. GM’s 8.1L motor, referred to as 8100 Vortec and first produced in 2001, was employed for Chevy Avalanche 2500, Silverado 2500HD and 3500HD plus their GMC Sierra doubles in 2001-2006.
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