Pontiac 181ci Specs: 3.80 x 2.66 in

Pontiac 181ci specs: 3.80 x 2.66 in (96.5 x 67.6 mm) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.

At a glance

Displacement	181 ci
Cylinders	6
Bore	3.800"
Stroke	2.660"
Advertised power	125 hp
Years	1985–1987

This engine

Engine	Displacement	Bore × Stroke	CR	HP
LN7	181 ci	3.8" × 2.66"	—	125

Factory cars with a Pontiac 181ci

• Pontiac Grand Am: 1985, LN7, 125 hp; 1986, LN7, 125 hp; 1987, LN7, 125 hp

What varies across the family

This family is represented by a single engine in the database: 181 ci, 6 cylinders, a 3.8" × 2.66" bore and stroke.

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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