Chevrolet 454ci Specs: 4.251 x 4.00 in

Chevrolet 454ci specs: 4.251 x 4.00 in (108 x 101.6 mm) bore and stroke, shared by all 11 versions. Displacement, compression and factory ratings.

At a glance

Displacement	454 ci
Cylinders	8
Bore	4.251"
Stroke	4.000"
Compression	8.9–10.1:1
Advertised power	205–450 hp
Years	1970–1993
Cylinder head data	2 of 11 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Chevrolet 454ci · 4.251" × 4.000" · 9.301:1	454 ci	4.251" × 4"	9.301:1	230–365
Chevrolet 454ci (1971) · 425 hp	454 ci	4.251" × 4"	10.101:1	425
Chevrolet 454ci · 4.251" × 4.000" · 8.951:1	454 ci	4.251" × 4"	8.951:1	215–270
Chevrolet 454ci (1975) · 215 hp	454 ci	4.251" × 4"	8.851:1	215
LS4	454 ci	4.251" × 4"	—	225–345
Chevrolet 454ci (1973–1978)	454 ci	4.251" × 4"	—	205–245
LF8	454 ci	4.251" × 4"	—	205
L19	454 ci	4.251" × 4"	—	230–255
LS5	454 ci	4.251" × 4"	—	360–390
Z15 / LS5	454 ci	4.251" × 4"	—	360
Z15 / LS6	454 ci	4.251" × 4"	—	450

Factory cars with a Chevrolet 454ci

• Chevrolet Bel Air: 1970, LS4, 345 hp
• Chevrolet Caprice: 1970, LS4, 345 hp; 1970, LS5, 390 hp; 1971, LS5, 365 hp; 1972, LS5, 270 hp; 1973, LS4, 245 hp; 1974, LS4, 235 hp; 1975, LS4, 215 hp; 1976, LS4, 225 hp
• Chevrolet Chevelle: 1970, Z15 / LS5, 360 hp; 1970, Z15 / LS6, 450 hp; 1971, LS5, 365 hp; 1972, LS5, 270 hp; 1973, LS4, 245 hp; 1974, LS4, 235 hp; 1975, LS4, 215 hp
• Chevrolet Corvette: 1970, LS5, 390 hp; 1971, LS5, 365 hp; 1971, LS6, 425 hp; 1972, LS5, 270 hp; 1973, LS4, 275 hp; 1974, LS4, 270 hp
• Chevrolet El Camino: 1970, Z15 / LS5, 360 hp; 1970, Z15 / LS6, 450 hp; 1971, LS5, 365 hp; 1972, LS5, 270 hp; 1973, LS4, 245 hp; 1974, LS4, 235 hp; 1975, LS4, 215 hp
• Chevrolet Impala: 1970, LS4, 345 hp; 1970, LS5, 390 hp; 1971, LS5, 365 hp; 1972, LS5, 270 hp; 1973, LS4, 245 hp; 1974, LS4, 235 hp; 1975, LS4, 215 hp; 1976, LS4, 225 hp
• Chevrolet Monte Carlo: 1970, LS5, 360 hp; 1971, LS5, 365 hp; 1972, LS5, 270 hp; 1973, LS4, 245 hp; 1974, LS4, 235 hp; 1975, LS4, 215 hp
• Chevrolet C/K Pickup: 1973, 240 hp; 1974, 230 hp; 1975, 215 hp; 1976, 245 hp; 1977, 245 hp; 1978, 205 hp; 1979, LF8, 205 hp; 1990, L19, 230 hp; 1991, L19, 255 hp; 1992, L19, 255 hp; 1993, L19, 255 hp
• Chevrolet Suburban: 1973, 240 hp; 1974, 230 hp; 1975; 1976; 1977; 1978; 1979, LF8, 205 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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