Ford 390ci Specs: 4.052 x 3.784 in

Ford 390ci specs: 4.052 x 3.784 in (102.9 x 96.1 mm) bore and stroke, shared by all 21 versions. Displacement, compression and factory ratings.

At a glance

Displacement	390 ci
Cylinders	8
Bore	4.052"
Stroke	3.784"
Compression	9.4–11.3:1
Advertised power	160–401 hp
Years	1961–1976
Cylinder head data	5 of 21 engines

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
390 V-8	390 ci	4.052" × 3.784"	—	160–255
FE 390	390 ci	4.052" × 3.784"	—	160
Z-code	390 ci	4.052" × 3.784"	—	300–315
P-code	390 ci	4.052" × 3.784"	—	330
Q-code	390 ci	4.052" × 3.784"	—	375
M-code	390 ci	4.052" × 3.784"	—	340–401
Y-code	390 ci	4.052" × 3.784"	—	265–275
S-code	390 ci	4.052" × 3.784"	—	320–335
H-code	390 ci	4.052" × 3.784"	—	270
Z	390 ci	4.052" × 3.784"	—	300–315
P	390 ci	4.052" × 3.784"	—	330
Q	390 ci	4.052" × 3.784"	—	375
M	390 ci	4.052" × 3.784"	—	401
Ford 390ci (1963)	390 ci	4.052" × 3.784"	—	300
H	390 ci	4.052" × 3.784"	—	275
Y	390 ci	4.052" × 3.784"	—	270
Ford 390ci · 4.052" × 3.784" · 10.1:1	390 ci	4.052" × 3.784"	10.1:1	300–330
Ford 390ci · 4.052" × 3.784" · 9.4:1	390 ci	4.052" × 3.784"	9.4:1	266
Ford 390ci · 4.052" × 3.784" · 9.5:1	390 ci	4.052" × 3.784"	9.5:1	265
Ford 390ci · 4.052" × 3.784" · 10.5:1	390 ci	4.052" × 3.784"	10.5:1	265–325
Ford 390ci · 4.052" × 3.784" · 11.3:1	390 ci	4.052" × 3.784"	11.3:1	320

Factory cars with a Ford 390ci

• Ford Fairlane: 1961, Z-code, 300 hp; 1961, P-code, 330 hp; 1961, Q-code, 375 hp; 1961, M-code, 401 hp; 1966, Y-code, 265 hp; 1966, Y-code, 275 hp; 1966, Z-code, 315 hp; 1966, S-code, 335 hp; 1967, H-code, 270 hp; 1967, S-code, 320 hp; 1968, H-code, 265 hp; 1968, S-code, 325 hp; 1969, S-code, 320 hp
• Ford Galaxie: 1961, 300 hp; 1961, 330 hp; 1961, 375 hp; 1961, 401 hp; 1962, 300 hp; 1962, 330 hp; 1962, 375 hp; 1962, 401 hp; 1963, 300 hp; 1964, 300 hp; 1965, 300 hp; 1966, 275 hp; 1966, 315 hp; 1967, 270 hp; 1967, 315 hp; 1968, 265 hp; 1968, 315 hp; 1969, 265 hp; 1970, 265 hp
• Ford Thunderbird: 1961, Z-code, 300 hp; 1962, Z-code, 300 hp; 1962, M-code, 340 hp; 1963, Z-code, 300 hp; 1963, M-code, 340 hp; 1964, Z-code, 300 hp; 1965, Z-code, 300 hp; 1966, Z-code, 315 hp; 1967, Z-code, 315 hp; 1968, Z-code, 315 hp
• Ford Mustang: 1967, S-code, 320 hp; 1968, X-code, 280 hp; 1968, S-code, 325 hp; 1969, S-code, 320 hp
• Ford F-100: 1968, 255 hp; 1969, 255 hp; 1970, 255 hp; 1971, 255 hp; 1972, 201 hp; 1973, 161 hp; 1974, 160 hp; 1975, 160 hp; 1976, 160 hp
• Ford F-250: 1968, 255 hp; 1969, 255 hp; 1970, 255 hp; 1971, 255 hp; 1972, 201 hp; 1973, 161 hp; 1974, 160 hp; 1975; 1976
• Ford Torino: 1968, H-code, 265 hp; 1968, S-code, 325 hp; 1969, S-code, 320 hp
• Ford F-150: 1975, 160 hp; 1976, 160 hp

What varies across the family

Compression spans 9.4:1 to 11.3:1, 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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