GMC 379ci Specs: 3.98 x 3.82 in

GMC 379ci specs: 3.98 x 3.82 in (101.1 x 97 mm) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.

At a glance

Displacement	379 ci
Cylinders	8
Bore	3.980"
Stroke	3.820"
Advertised power	130–145 hp
Years	1984–1993

This engine

Engine	Displacement	Bore × Stroke	CR	HP
LH6	379 ci	3.98" × 3.82"	—	130–145

Factory cars with a GMC 379ci

• GMC Jimmy: 1984, LH6, 130 hp; 1985, LH6, 130 hp; 1986, LH6, 130 hp; 1987, LH6, 130 hp; 1988, LH6; 1989, LH6, 130 hp; 1990, LH6, 145 hp; 1991, LH6
• GMC Sierra 1500: 1988, LH6, 140 hp; 1989, LH6, 140 hp; 1990, LH6, 140 hp; 1991, LH6, 140 hp; 1992, LH6, 140 hp; 1993, LH6, 140 hp

What varies across the family

This family is represented by a single engine in the database: 379 ci, 8 cylinders, a 3.98" × 3.82" 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.

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