GMC Vortec 4300 Specs: 4.00 x 3.48 in

GMC Vortec 4300 (4.3L V6) specs: 4.00 x 3.48 in (101.6 x 88.4 mm) bore and stroke, shared by all 7 versions. Displacement, compression and factory ratings.

At a glance

Displacement	262 ci
Cylinders	6
Bore	4.000"
Stroke	3.480"
Compression	9.2:1
Advertised power	160–285 hp
Years	1988–2021

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Vortec 4300 (4.3L V6) · 4.000" × 3.480" · 9.2:1	262 ci	4" × 3.4803"	9.2:1	180–195
L35	262 ci	4" × 3.4803"	—	180–200
LF6	262 ci	4" × 3.4803"	—	175
LU3	262 ci	4" × 3.4803"	—	195–200
LV3	262 ci	4" × 3.4803"	—	285
LB4	262 ci	4" × 3.4803"	—	160–165
LB4/Z79	262 ci	4" × 3.4803"	—	280

Factory cars with a Vortec 4300 (4.3L V6)

• GMC Jimmy: 1988, LB4, 160 hp; 1989, LB4, 160 hp; 1990, LB4, 160 hp; 1991, LB4, 160 hp; 1992, LB4, 160 hp; 1992, L35, 200 hp; 1992, LB4/Z79, 280 hp; 1993, LB4/Z79; 1993, LB4, 165 hp; 1993, L35, 200 hp; 1994, LB4, 165 hp; 1994, L35, 200 hp; 1995, L35, 195 hp; 1996, L35, 190 hp; 1997, L35, 190 hp; 1998, L35, 190 hp; 1999, L35, 190 hp; 2000, L35, 190 hp; 2001, L35, 190 hp
• GMC Sierra 1500: 1988, LB4, 160 hp; 1989, LB4, 160 hp; 1990, LB4, 160 hp; 1991, LB4, 160 hp; 1992, LB4, 160 hp; 1993, LB4, 165 hp; 1994, LB4, 165 hp; 1995, LB4, 160 hp; 1996, L35, 200 hp; 1997, L35, 200 hp; 1998, L35, 200 hp; 1999, L35, 200 hp; 2000, L35, 200 hp; 2001, L35, 200 hp; 2002, L35, 200 hp; 2003, LU3; 2004, LU3; 2005, LU3; 2006, LU3, 195 hp; 2007, LU3, 195 hp; 2008, LU3, 195 hp; 2009, LU3, 195 hp; 2010, LU3, 195 hp; 2011, LU3, 195 hp; 2012, LU3, 195 hp; 2013, LU3, 195 hp; 2014, LV3, 285 hp; 2015, LV3, 285 hp; 2016, LV3, 285 hp; 2017, LV3, 285 hp; 2018, LV3, 285 hp; 2019, LV3, 285 hp; 2020, LV3, 285 hp; 2021, LV3, 285 hp
• Chevrolet S-10: 1992, L35, 195 hp; 1993, L35, 195 hp; 1994, L35, 195 hp; 1995, L35, 180–191 hp; 1996, LF6, 170–175 hp; 1996, L35, 180 hp; 1997, LF6, 170–175 hp; 1997, L35, 180 hp; 1998, LF6, 175 hp; 1998, L35, 180 hp; 1999, LF6, 175 hp; 1999, L35, 180 hp; 2000, L35, 180 hp; 2001, L35, 180 hp; 2002, L35, 180 hp; 2003, L35, 180 hp; 2004, L35, 180 hp
• Chevrolet C/K Pickup: 1996, L35, 200 hp; 1997, L35, 200 hp; 1998, L35, 200 hp
• Chevrolet Silverado 1500: 1999, L35, 200 hp; 2000, L35, 200 hp; 2001, L35, 200 hp; 2002, L35, 200 hp; 2003, LU3, 200 hp; 2004, LU3, 195 hp; 2005, LU3, 195 hp; 2006, LU3, 195 hp; 2007, LU3, 195 hp; 2008, LU3, 195 hp; 2009, LU3, 195 hp; 2010, LU3, 195 hp; 2011, LU3, 195 hp; 2012, LU3, 195 hp; 2013, LU3, 195 hp; 2014, LV3, 285 hp; 2015, LV3, 285 hp; 2016, LV3, 285 hp; 2017, LV3, 285 hp; 2018, LV3, 285 hp; 2019, LV3, 285 hp; 2020, LV3, 285 hp; 2021, LV3, 285 hp

What varies across the family

All are oversquare — bore larger than stroke, which favours revs over low-end torque.

Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.

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