Chevrolet 348ci Specs: 4.125 x 3.25 in

Chevrolet 348ci specs: 4.125 x 3.25 in (104.8 x 82.6 mm) bore and stroke, shared by all 13 versions. Displacement, compression and factory ratings.

At a glance

Displacement	348 ci
Cylinders	8
Bore	4.125"
Stroke	3.250"
Compression	9.5–11.3:1
Advertised power	250–350 hp
Years	1958–1961

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Chevrolet 348ci · 4.125" × 3.250" · 9.5:1	348 ci	4.125" × 3.25"	9.5:1	250–280
Chevrolet 348ci · 4.125" × 3.250" · 11:1	348 ci	4.125" × 3.25"	11:1	305–315
Chevrolet 348ci · 4.125" × 3.250" · 11.25:1	348 ci	4.125" × 3.25"	11.25:1	320–350
Turbo-Thrust Special	348 ci	4.125" × 3.25"	—	305
RPO 576	348 ci	4.125" × 3.25"	—	250–305
RPO 573	348 ci	4.125" × 3.25"	—	280
RPO 574	348 ci	4.125" × 3.25"	—	315–335
RPO 577 / 590	348 ci	4.125" × 3.25"	—	320
RPO 574 / 571	348 ci	4.125" × 3.25"	—	335
RPO 572	348 ci	4.125" × 3.25"	—	340
Chevrolet 348ci (1959)	348 ci	4.125" × 3.25"	—	300
RPO 576/577	348 ci	4.125" × 3.25"	—	305
RPO 577	348 ci	4.125" × 3.25"	—	320

Factory cars with a Chevrolet 348ci

• Chevrolet Bel Air: 1958, 250 hp; 1958, 280 hp; 1958, 315 hp; 1959, RPO 576, 250 hp; 1959, RPO 573, 280 hp; 1959, RPO 574, 315 hp; 1959, RPO 574, 335 hp; 1960, RPO 576, 250 hp; 1960, RPO 573, 280 hp; 1960, RPO 576, 305 hp; 1960, RPO 577 / 590, 320 hp; 1960, RPO 574 / 571, 335 hp; 1961, RPO 576, 250 hp; 1961, RPO 573, 280 hp; 1961, 305 hp; 1961, RPO 572, 340 hp; 1961, 350 hp
• Chevrolet Impala: 1958, 250 hp; 1958, 280 hp; 1958, 315 hp; 1959, RPO 576, 250 hp; 1959, RPO 573, 280 hp; 1959, RPO 576/577, 305 hp; 1959, RPO 574, 315 hp; 1959, RPO 577, 320 hp; 1959, RPO 574, 335 hp; 1960, RPO 576, 250 hp; 1960, RPO 573, 280 hp; 1960, RPO 576, 305 hp; 1960, RPO 577 / 590, 320 hp; 1960, RPO 574 / 571, 335 hp; 1961, RPO 576, 250 hp; 1961, RPO 573, 280 hp; 1961, 305 hp; 1961, RPO 572, 340 hp; 1961, 350 hp
• Chevrolet El Camino: 1959, 250 hp; 1959, 280 hp; 1959, 300 hp; 1959, 315 hp; 1960, 250 hp; 1960, 280 hp; 1960, 320 hp; 1960, 335 hp

What varies across the family

Compression spans 9.5:1 to 11.25:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.

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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