GMC 4.3 Specs

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      The 4.3 liter that was used by GMC is the same 4.3 liter used in Chevrolet vehicles. This engine was introduced in 1990 as a replacement to the 2.8 liter V-6. This engine was placed in several vehicles, including the S-15/Sonoma, Jimmy and Typhoon/Syclone. The engine was removed from GMC's lineup in 2005, along with the Sonoma, and replaced with the 4.2 liter I-6.

    S15/Sonoma

    • The Sonoma, called the S15 in the earlier years, was the longest running GMC vehicle to have the 4.3 liter. It utilized this engine from 1990 through 2004. This engine had a bore, cylinder width, of 4.00 inches and a stroke, piston travel inside the cylinder, of 3.48 inches. It had a compression ratio of 9.3:1 from 1990 through 1992; 9.1:1 from 1993 through 1995; and 9.2:1 from 1996 through 2004. The engine produced 160 horsepower (hp) and 235 foot-pounds of torque from 1990 through 1992; 165 hp and 236 foot-pounds of torque from 1993 through 1994; 155 hp and 235 foot-pounds of torque in 1995; 180 hp and 245 foot-pounds of torque from 1995 through 1999; and 190 hp and 250 foot-pounds of torque from 2000 through 2004.

    Jimmy

    • The Jimmy was GMC's small sport utility vehicle. The 4.3, when installed in the Jimmy had a bore of 4.00 inches and a stroke of 3.48 inches. It had a compression ratio of 9.3:1 from 1990 through 1992; 9.1:1 from 1993 through 1995; and 9.2:1 from 1996 through 2004. The 4.3, when in the Jimmy, produced 160 hp and 235 foot-pounds of torque from 1990 through 1992; 165 hp and 236 foot-pounds of torque from 1993 through 1994; 195 hp and 260 foot-pounds of torque in 1995; and 190 hp and 250 foot-pounds of torque from 1996 through 2001.

    Typhoon/Syclone

    • The Typhoon and Syclone were special edition models built by GMC. The Syclone is based on the Sonoma pickup and was produced from 1991 through 1992. The Typhoon, based on the Jimmy, was produced from 1992 through 1993. Both vehicles were powered by the same turbocharged 4.3 liter V-6. The 4.3 liter in these special editions had the same 4.00 inch bore and 3.48 inch stroke as the other 4.3 liters. The compression was reduced to 8.4:1 to compensate for the forced air from the turbo. These engines produced 280 hp and 350 foot-pounds of torque.

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