Pontiac 301ci Specs: 4.002 x 3.01 in

Pontiac 301ci specs: 4.002 x 3.01 in (101.7 x 76.5 mm) bore and stroke, shared by all 6 versions. Displacement, compression and factory ratings.

At a glance

Displacement	301 ci
Cylinders	8
Bore	4.002"
Stroke	3.010"
Compression	9.5:1
Advertised power	135–210 hp
Years	1977–1981
Cylinder head data	1 of 6 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Pontiac 301ci (1977) · 135 hp	301 ci	4.002" × 3.01"	9.521:1	135
L27	301 ci	4.002" × 3.01"	—	135–140
L37	301 ci	4.002" × 3.01"	—	135–150
L37 + W72	301 ci	4.002" × 3.01"	—	155
LU8	301 ci	4.002" × 3.01"	—	200–210
W72	301 ci	4.002" × 3.01"	—	155

Factory cars with a Pontiac 301ci

• Pontiac Firebird: 1977, L27, 135 hp; 1979, L27, 135 hp; 1979, L37, 150 hp; 1980, L37, 140 hp; 1980, L37 + W72, 155 hp; 1980, LU8, 210 hp; 1981, L37, 150 hp; 1981, LU8, 200 hp
• Pontiac Grand Prix: 1977, 135 hp; 1978, L27, 140 hp; 1978, L37, 150 hp; 1979, L27, 135 hp; 1979, L37, 150 hp; 1980, L37, 140 hp; 1980, W72, 155 hp
• Pontiac LeMans: 1977, L27, 135 hp; 1979, L27, 135 hp; 1979, L37, 150 hp; 1980, L37, 140 hp; 1981, L37, 135 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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