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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

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Old 05-09-2011, 01:46 AM
Nuj79 Nuj79 is offline
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Engine Number, Size vs VIN number

I just bought a 1968 F100. The VIN is F10YR****** which when I decoded it says it originally had a 360 (if I got it right). But the guy I brought it from said it has a 390. I got C6AE-XXXX-G off the top of the engine. Which I was told means its a '66 engine. So I'm assuming it's a totally different engine. How do I tell what engine it is?
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Old 05-09-2011, 05:23 AM
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You both could be right. The VIN tells you what it was the day it left the factory, & no more. After 40 years many things could have been changed.

All the FE engines look the same on the outside, the 390 is a more engine so all FEs become 390s on sale day.

Top of engine = intake, if a 4 barrel carb has been added, a 4 barrel intake would be required.

C6 = 66, Bill can answer in full detail.




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Old 05-09-2011, 11:07 AM
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66 parts were placed on many vehicles after 66... You will need to check the stroke of the motor (or pull the cast number off the crank), search for the how-to. This will give you a better understanding of the internals of the motor, which is where the difference between 360 and 390 reside.
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Old 05-09-2011, 11:30 AM
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Quote:
Originally Posted by Nuj79 View Post
I just bought a 1968 F100. The VIN is F10YR****** which when I decoded it says it originally had a 360 (if I got it right). But the guy I brought it from said it has a 390.

I got C6AE-9425-G off the top of the engine. Which I was told means its a '66 engine. So I'm assuming it's a totally different engine. How do I tell what engine it is?
F10 = F100 2WD

Y = 360 2V

R = San Jose CA Assembly Plant.

On sale day, 360 engines magically become 390's! Most sellers haven't a single clue, many have never heard of a 360, so on sale day...the 360 (or 1965/67 352) becomes a 390.

Your truck is 43 years old. So...who knows what changes could have been made by previous owners?

And, do not believe a single word a seller claims. Sellers (private or not) can lie just as well as new/used car dealers, lawyers and...politicians!

Research first, ask questions from knowledgeable peeps if unsure.

1968/76 360/390: The bore is the same (4.05"), the stroke is different: 360 = 3.50" / 390 = 3.78"

The fact that the intake manifold (top of the engine) has a C6AE-9425-G casting number marked on it, does not mean the engine is from a 1966.

If it's a 4V manifold (a popular swap), it's from a 1966/67 390/410/428 Passenger Car. F100/350's with FE (352/360/390) engines did not come w/a 4V until 1974/76, and then 390's only.
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Old 05-09-2011, 11:30 AM
 
 
 
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