GMC 293ci Specs: 3.78 x 3.268 in

GMC 293ci specs: 3.78 x 3.268 in (96 x 83 mm) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	293 ci
Cylinders	8
Bore	3.780"
Stroke	3.268"
Advertised power	255–302 hp
Years	1999–2013

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
LR4	293 ci	3.7799" × 3.2677"	—	255–285
LY2	293 ci	3.7799" × 3.2677"	—	295
L20	293 ci	3.7799" × 3.2677"	—	302

Factory cars with a GMC 293ci

• GMC Sierra 1500: 1999, LR4, 255 hp; 2000, LR4, 270 hp; 2001, LR4, 270 hp; 2002, LR4, 270 hp; 2003, LR4, 270 hp; 2004, LR4, 285 hp; 2005, LR4, 285 hp; 2006, LR4, 285 hp; 2007, LR4, 285 hp; 2007, LY2, 295 hp; 2008, LY2, 295 hp; 2009, LY2, 295 hp; 2010, L20, 302 hp; 2011, L20, 302 hp; 2012, L20, 302 hp; 2013, L20, 302 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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