Cat pulling a chevy out of a creek cat pulling a chevy out of a creek skip navigation 10 extreme dangerous biggest logging wood truck driving skill heavy equipment machines working . Gm 81l vortec v 8 specs history and horsepower and torque curves the gm 81l was introduced in 2001 and used in various heavy duty applications including chevrolet silverado and gmc sierra 2500 3500hd pickups through the 2006 model year although this large displacement engine produces considerable horsepower and torque it was retired in favor of a more economical engine platform. Tbi fuel injection conversion using a gm tbi efi system one of the most popular efi conversions to older chevy engines or any engine for that matter is the gm tbi system using the 1227747 ecm there are many others that will do the same thing but the 1227747 is most well known and documented and will be the basis for this article. Battery ignition using external coil how to properly connect this type of coil to your engine sometimes substituted for a failed magneto coil ignition system go here for more in depth info
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