Chevrolet 230ci Specs: 3.875 x 3.25 in

Chevrolet 230ci specs: 3.875 x 3.25 in (98.4 x 82.6 mm) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings.

At a glance

Displacement	230 ci
Cylinders	6
Bore	3.875"
Stroke	3.250"
Compression	8.5:1
Advertised power	140–155 hp
Years	1963–1970
Cylinder head data	1 of 2 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Chevrolet 230ci (1963–1964)	230 ci	3.875" × 3.25"	—	140
Chevrolet 230ci · 3.875" × 3.25" · 8.5:1	230 ci	3.875" × 3.25"	8.5:1	140–155

Factory cars with a Chevrolet 230ci

• Chevrolet Bel Air: 1963, 140 hp; 1964, 140 hp; 1965, 140 hp
• Chevrolet Impala: 1963, 140 hp; 1964, 140 hp; 1965, 140 hp
• Chevrolet Suburban: 1963, 140 hp; 1964, 140 hp; 1965, 140 hp
• Chevrolet Chevelle: 1964, L61, 155 hp; 1965, L26, 140 hp; 1966, L26, 140 hp; 1967, 140 hp; 1968, 140 hp; 1969, 140 hp
• Chevrolet El Camino: 1964, L61, 155 hp; 1969, 140 hp
• Chevrolet Nova: 1964, RPO, 155 hp; 1965, L26, 140 hp; 1966, L26, 140 hp; 1968, 140 hp; 1969, 140 hp; 1970, 140 hp
• Chevrolet Camaro: 1967, L26, 140 hp; 1968, L26, 140 hp; 1969, L26, 140 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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