Chevrolet 327ci Engine Specs

Bore, stroke, displacement and compression for all 20 Chevrolet 327ci engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	327 ci
Cylinders	8
Bore	4.001–4.065"
Stroke	3.150–3.250"
Compression	8.8–12.5:1
Advertised power	210–550 hp
Years	1962–2023
Cylinder head data	8 of 20 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Chevrolet 327ci · 4.065" × 3.150" · 11.15:1	327 ci	4.065" × 3.15"	11.15:1	500–550
Chevrolet 327ci · 4.065" × 3.150" · 12.5:1	327 ci	4.065" × 3.15"	12.5:1	390
RPO 300	327 ci	4.001" × 3.25"	—	250
RPO 397	327 ci	4.001" × 3.25"	—	300
L30	327 ci	4.001" × 3.25"	—	220–250
L74	327 ci	4.001" × 3.25"	—	300
Chevrolet 327ci (1962–1968)	327 ci	4.001" × 3.25"	—	220–250
L73	327 ci	4.001" × 3.25"	—	240
583	327 ci	4.001" × 3.25"	—	300
396	327 ci	4.001" × 3.25"	—	340
582	327 ci	4.001" × 3.25"	—	360
L75	327 ci	4.001" × 3.25"	—	300
L76	327 ci	4.001" × 3.25"	—	340–365
L84	327 ci	4.001" × 3.25"	—	360–375
Chevrolet 327ci · 4.001" × 3.25" · 10.5:1	327 ci	4.001" × 3.25"	10.5:1	250–300
Chevrolet 327ci · 4.001" × 3.25" · 11:1	327 ci	4.001" × 3.25"	11:1	325–365
Chevrolet 327ci · 4.001" × 3.25" · 10.25:1	327 ci	4.001" × 3.25"	10.25:1	275–300
Chevrolet 327ci · 4.001" × 3.25" · 8.75:1	327 ci	4.001" × 3.25"	8.75:1	210–250
Chevrolet 327ci · 4.001" × 3.25" · 10:1	327 ci	4.001" × 3.25"	10:1	275–300
Chevrolet 327ci · 4.001" × 3.25" · 9:1	327 ci	4.001" × 3.25"	9:1	210–235

Factory cars with a Chevrolet 327ci

• Chevrolet Bel Air: 1962, RPO 300, 250 hp; 1962, RPO 397, 300 hp; 1963, L30, 250 hp; 1963, L74, 300 hp; 1964, L30, 250 hp; 1964, L74, 300 hp; 1965, L30, 250 hp; 1965, L74, 300 hp; 1966, L30, 275 hp; 1967, L30, 275 hp; 1968, L73, 250 hp; 1968, L30, 275 hp; 1969, 235 hp
• Chevrolet Corvette: 1962, 250 hp; 1962, 300 hp; 1962, 340 hp; 1962, 360 hp; 1963, 250 hp; 1963, L75, 300 hp; 1963, L76, 340 hp; 1963, L84, 360 hp; 1964, 250 hp; 1964, L75, 300 hp; 1964, L76, 365 hp; 1964, L84, 375 hp; 1965, 250 hp; 1965, L75, 300 hp; 1965, L79, 350 hp; 1965, L76, 365 hp; 1965, L84, 375 hp; 1966, 300 hp; 1966, L79, 350 hp; 1967, 300 hp; 1967, L79, 350 hp; 1968, 300 hp; 1968, L79, 350 hp
• Chevrolet Impala: 1962, RPO 300, 250 hp; 1962, RPO 397, 300 hp; 1963, L30, 250 hp; 1963, L74, 300 hp; 1964, L30, 250 hp; 1964, L74, 300 hp; 1965, L30, 250 hp; 1965, L74, 300 hp; 1966, L30, 275 hp; 1967, L30, 275 hp; 1968, L73, 250 hp; 1968, L30, 275 hp; 1969, 235 hp
• Chevrolet Chevelle: 1964, L30, 250 hp; 1964, L74, 300 hp; 1965, L30, 250 hp; 1965, L74, 300 hp; 1965, L79, 350 hp; 1966, L30, 275 hp; 1967, L30, 275 hp; 1967, L79, 325 hp; 1968, 250 hp; 1968, L30, 275 hp; 1968, L79, 325 hp
• Chevrolet El Camino: 1964, L30, 250 hp; 1964, L74, 300 hp; 1965, L30, 250 hp; 1965, L74, 300 hp; 1965, L79, 350 hp; 1966, L30, 275 hp; 1967, L30, 275 hp; 1967, L79, 325 hp; 1968, L73, 250 hp; 1968, L30, 275 hp; 1968, L79, 325 hp
• Chevrolet Caprice: 1965, L30, 250 hp; 1965, L74, 300 hp; 1966, L30, 275 hp; 1967, L30, 275 hp; 1968, L73, 250 hp; 1968, L30, 275 hp; 1969, 235 hp
• Chevrolet Nova: 1965, L30, 250 hp; 1965, L74, 300 hp; 1966, L30, 275 hp; 1966, L79, 350 hp; 1967, L30, 275 hp; 1968, L30, 275 hp; 1968, L79, 325 hp
• Chevrolet C/K Pickup: 1966, 220 hp; 1967, L30, 220 hp; 1968, L73, 240 hp
• Chevrolet Suburban: 1966, 220 hp; 1967, 220 hp; 1968, 240 hp
• Chevrolet Camaro: 1967, LF7, 210 hp; 1967, L30, 275 hp; 1968, LF7, 210 hp; 1968, L30, 275 hp; 1969, LF7, 210 hp

What varies across the family

Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.

Compression spans 8.75:1 to 12.5:1, 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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