Pontiac 191ci Specs: 3.50 x 3.31 in

Pontiac 191ci specs: 3.50 x 3.31 in (88.9 x 84.1 mm) bore and stroke, shared by all 6 versions. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	191 ci
Cylinders	6
Bore	3.500"
Stroke	3.310"
Compression	9.0–9.6:1
Advertised power	120–205 hp
Years	1989–2003
Cylinder head data	2 of 6 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Pontiac 191ci · 3.500" × 3.310" · 9:1	191 ci	3.5" × 3.31"	9:1	120–140
Pontiac 191ci · 3.500" × 3.310" · 9.6:1	191 ci	3.5" × 3.31"	9.6:1	155–165
LH0	191 ci	3.5" × 3.31"	—	140
LG5	191 ci	3.5" × 3.31"	—	205
L82	191 ci	3.5" × 3.31"	—	160
LG8	191 ci	3.5" × 3.31"	—	175

Factory cars with a Pontiac 191ci

• Pontiac Grand Prix: 1989, LH0, 140 hp; 1989, LG5, 205 hp; 1990, LH0, 140 hp; 1990, LG5, 205 hp; 1991, LH0, 140 hp; 1992, LH0, 140 hp; 1993, LH0, 140 hp; 1994, L82, 160 hp; 1995, L82, 160 hp; 1996, L82, 160 hp; 1997, L82, 160 hp; 1998, L82, 160 hp; 1999, L82, 160 hp; 2000, LG8, 175 hp; 2001, LG8, 175 hp; 2002, LG8, 175 hp; 2003, LG8, 175 hp
• Pontiac Firebird: 1990, LH0, 140 hp; 1991, LH0, 140 hp; 1992, LH0, 140 hp
• Buick Skylark: 1994, L82, 155 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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