Pontiac 151ci Specs: 4.002 x 3.01 in

Pontiac 151ci specs: 4.002 x 3.01 in (101.7 x 76.5 mm) bore and stroke, shared by all 7 versions. Displacement, compression and factory ratings.

At a glance

Displacement	151 ci
Cylinders	4
Bore	4.002"
Stroke	3.010"
Compression	8.5–9.6:1
Advertised power	82–105 hp
Years	1977–1991
Cylinder head data	4 of 7 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Pontiac 151ci (1977) · 87 hp	151 ci	4.002" × 3.01"	9.251:1	87
Pontiac 151ci (1985) · 92 hp	151 ci	4.002" × 3.01"	9.63:1	92
Pontiac 151ci (1986) · 92 hp	151 ci	4.002" × 3.01"	9.14:1	92
Pontiac 151ci · 4.002" × 3.010" · 8.5:1	151 ci	4.002" × 3.01"	8.5:1	98–105
LN8	151 ci	4.002" × 3.01"	—	92
GM 151 2-bbl	151 ci	4.002" × 3.01"	—	82
LQ9	151 ci	4.002" × 3.01"	—	88–92

Factory cars with a Pontiac 151ci

• Jeep CJ: 1980, 82 hp; 1981, 82 hp; 1982, 82 hp; 1983, 82 hp
• Pontiac Firebird: 1982, LQ9, 90 hp; 1983, LQ9, 90–92 hp; 1984, LQ9, 90–92 hp; 1985, LQ9, 88 hp; 1986, LQ9, 88 hp
• GMC Jimmy: 1985, LN8; 1987, LN8

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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