GMC 496ci Specs: 4.25 x 4.37 in

GMC 496ci specs: 4.25 x 4.37 in (108 x 111 mm) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.

At a glance

Displacement	496 ci
Cylinders	8
Bore	4.250"
Stroke	4.370"
Compression	9.1:1
Advertised power	330–340 hp
Years	2001–2007

This engine

Engine	Displacement	Bore × Stroke	CR	HP
L18	496 ci	4.25" × 4.37"	9.1:1	330–340

Factory cars with a GMC 496ci

• GMC Sierra HD: 2001, L18, 340 hp; 2002, L18, 340 hp; 2003, L18, 340 hp; 2004, L18; 2005, L18, 330 hp; 2006, L18, 330 hp; 2007, L18, 330 hp
• GMC Vandura / Savana: 2001, L18; 2002, L18
• GMC Yukon: 2001, L18, 340 hp; 2002, L18, 340 hp; 2003, L18, 340 hp; 2004, L18; 2005, L18; 2006, L18

What varies across the family

This family is represented by a single engine in the database: 496 ci, 8 cylinders, a 4.25" × 4.37" bore and stroke.

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.

← All GMC engines