Oldsmobile 330ci Specs: 3.938 x 3.385 in

Oldsmobile 330ci specs: 3.938 x 3.385 in (100 x 86 mm) bore and stroke, shared by all 6 versions. Displacement, compression and factory ratings.

At a glance

Displacement	330 ci
Cylinders	8
Bore	3.938"
Stroke	3.385"
Compression	9.0–10.3:1
Advertised power	230–320 hp
Years	1964–1967
Cylinder head data	2 of 6 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Oldsmobile 330ci (1965)	330 ci	3.938" × 3.385"	—	250–315
L65	330 ci	3.938" × 3.385"	—	250
L73	330 ci	3.938" × 3.385"	—	310
L74	330 ci	3.938" × 3.385"	—	320
Oldsmobile 330ci · 3.938" × 3.385" · 9:1	330 ci	3.938" × 3.385"	9:1	230
Oldsmobile 330ci · 3.938" × 3.385" · 10.25:1	330 ci	3.938" × 3.385"	10.25:1	245–310

Factory cars with a Oldsmobile 330ci

• Oldsmobile Cutlass: 1964, 210–230 hp; 1964, 290 hp; 1964, B09, 310 hp; 1965, 250 hp; 1965, 315 hp; 1966, L65, 250 hp; 1966, L73, 310 hp; 1966, L74, 320 hp; 1967, L65, 250 hp; 1967, L73, 310 hp; 1967, L74, 320 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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