Hi guys
I m looking for a 391 motor and was hoping you guys could tell me what trucks I should be looking for. And what years.

 

70's through 78.

 

391 4V FT: 1966/69 B/C/F/N/NT/T500/750 // 1970/78 B/C/F/L/LN500/750.

1964/78 like trucks were also available with FT: 330 2V Medium Duty - 330 2V Heavy Duty - 361 2V - 361 4V (1974/78).

All these FT engines look identical / The 4th digit of the VIN is the engine code. F = 391 4V (1966/78).

'Course, who knows if this engine is still in place today?

 

I found a 600 coe can some one give me a hand deciphering the tag?

 

What is K mean in the fourth place of the vin

 

It's not a C600 and I assume you only want the Warranty Number (VIN) decoded.

C75 = C750 Tilt Cab.

K = 361 2V FT engine (K used 1964/65 only).

U = Louisville KY Assembly Plant.

645859 = 1965, assembled January 1965.

 

Thank you number dummy. Would this 361 ft motor have harden valves? The difference between a 361 ft and the 391ft is the crank?
Hp and torque of both?

 

No hardened valve seats on a truck this old. I believe they were introduced in 1972.

361 crank same as 391, but while the bore is the same (4.05"), the 361 pistons are different than 391.

 

If it had the same bore and stroke the Cubic Inch would be the same, pistons would not matter

361 Crank is 3.5 Stroke Bore is 4..05

391 crank is 3.78 Stroke (same as 390 & 427) 391 Bore same as 390 4.052

Per my Ford Book the 330, 361 & 391 have Exhaust seat inserts.

I remember working on many at my first job which was a machine shop (nearly 40yrs ago)

 

There are exhaust and intake (beginning 1968) valve seat inserts listed, but the parts catalog doesn't say if they are hardened.

I can only go by what the parts catalog lists inre to pistons.

 

360 to 390, the crank, rods and pistons differ.

Does the 361 have longer rods than the 391, as a 360 does compared to a 390?

It could be just crank and pistons that differ 361 to 391. You'd have to find the compression heights for the pistons and do the math.

 

330 2V M/D FT uses the same crankshaft and rods as 352/360 FE.

330 2V H/D, 361 & 391 FT's use the same rods as 390 FE.

However, the 330 2V H/D, 361 & 391 rods are somewhat year specific. 1964/65 or 1966/70 or 1971/78.

330 2V H/D & 361 use the same crankshaft, 391 crankshaft is 391 only.

 

361 & 391 has same rod length as does HD 330 6.486-6.490

352 rod is 6.538-6.542

very low comp spec on 361-391 engines

The combustion chambers on a 361-391 average 2 cc's larger than the 352

 

My book says hardened exhaust seats and also sodium filled exhaust valves
on 361 & 391 Starting 1966

 

I found a motor in a one ton ford truck the air cleaner said 39* the last number was scratched so I could not make out the number.
I am thinking it is a 390 fe motor?
I am trading him some Chevy stuff for it .
I will have the block numbers tomorrow
Will a 390 fe work as will in my truck as a 391ft?
I am putting it in this!