460??? or 390????
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Mountain Pass
Joined: Dec 2006
Posts: 196
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From: INYOKERN, CALIFORNIA
460??? or 390????
I am going to look at a 1976 F250 Supercab truck tomorrow. The present owner say's it has a 390 4 barrel/ C6 engine/trans in it. I had thought that the 360/390 FE series engines had been phased out by 1976, but heck, I don't know everything! Anyone like to weigh in on this question?? Thanks! Dale
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Joined: Sep 2014
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it should be a 390. the few 76 supercabs ive seen were FE. from what ive read they started using the 400m motors in 77 in the light duty trucks which was used supposed to be a more economical alternative to FE's and 460s. ive seen the M's in 78 79 supercabs ive owned. ive seen 460's in the later ones as well. 1976 was the last year for FE like dude above states.
Laughing Gas
Joined: May 2006
Posts: 1,140
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From: Port Orchard Wa
After 40 years, you never know.....
Very simple count the valve covers bolts
2 bolts: 239/256/272/292/312 (produced from 1954 to 1964)
5 bolts: 332/352/360/361/390/391/406/410/427/428 (FE engine)
6 bolts: 221/260/289/302/351W
7 bolts: 429/460
8 bolts: 351C/351M/400
Very simple count the valve covers bolts
2 bolts: 239/256/272/292/312 (produced from 1954 to 1964)
5 bolts: 332/352/360/361/390/391/406/410/427/428 (FE engine)
6 bolts: 221/260/289/302/351W
7 bolts: 429/460
8 bolts: 351C/351M/400
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
it should be a 390. 
the few 76 supercabs ive seen were FE. from what ive read they started using the 400m motors in 77 in the light duty trucks which was used supposed to be a more economical alternative to FE's and 460s. ive seen the M's in 78 79 supercabs ive owned. ive seen 460's in the later ones as well. 1976 was the last year for FE like dude above states.
the few 76 supercabs ive seen were FE. from what ive read they started using the 400m motors in 77 in the light duty trucks which was used supposed to be a more economical alternative to FE's and 460s. ive seen the M's in 78 79 supercabs ive owned. ive seen 460's in the later ones as well. 1976 was the last year for FE like dude above states.360/390's cancelled at the end of the 1976 model run. There is no such thing as a 400M, it's just plain 'ol 400.
351M/400's introduced in 1977 F100/350's & 1978/79 Bronco's.
460's (2WD only): 1973/76 F100 / 1973/79 F250/350 / 1975/79 F150.
The engine code is the 4th digit of the VIN:
1968/76 F100/350: A = 240 1V I-6 (1968/74) / B = 300 1V I-6 / G = 302 2V (F100/150 only) / H = 390 2V / J = 460 4V / M = 390 4V (1974/76).
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