390 or 360?
Mountain Pass
Joined: Apr 2002
Posts: 230
Likes: 0
390 or 360?
I recently bought a 71 F-100. The guy I bought it from told me that it had a 390. The VIN has a Y, the air cleaner says 360, but the valve cover has a decal that says 390.
Any suggestions how I might find out whether the engine was swapped?
Is the 390 just a stroked and/or bored 360?
Any suggestions how I might find out whether the engine was swapped?
Is the 390 just a stroked and/or bored 360?
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
390 or 360?
Dan the 360 is a detuned 390 for early emissions. It is a 390 bore with a 352 crank. Grab a piece of white jacketed house wire about 8" long and with a bud and a sharpie drop the wire in one of the front cylinders through the sparkplug hole. Have the bud rotate the engine with a socket on one of the pullys while you have the sharpie resting against the manifold and on the wire. Rotate the engine a couple of rounds and then measure the length of the wire. Report the length back here and we can tell what engine that you really have. 
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John
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John
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In the cool still quiet of night, you can hear chevies rusting away.
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
390 or 360?
Just some misc info:
4.00 X 3.5 = 352
4.05 X 3.5 = 360
4.05 X 3.784 = 390
I too fell victim to the "Oh yeah its a 390" scam. Its a 390 now. Let us know what you find. John's method to distinguish between the two works well.
4.00 X 3.5 = 352
4.05 X 3.5 = 360
4.05 X 3.784 = 390
I too fell victim to the "Oh yeah its a 390" scam. Its a 390 now. Let us know what you find. John's method to distinguish between the two works well.
Mountain Pass
Joined: Apr 2002
Posts: 230
Likes: 0
390 or 360?
Thanks, I'll check my stroke.
Just for the record, the guy that I bought it from didn't seem too sure either. He said that he had been told it was a 390 and literally said that it was either a 360 or 390. I don't really mean to sound like I was scammed.
I just wanted a half ton Ford with an automatic and a V-8 so it didn't matter much to me.
Thanks again.
Just for the record, the guy that I bought it from didn't seem too sure either. He said that he had been told it was a 390 and literally said that it was either a 360 or 390. I don't really mean to sound like I was scammed.
I just wanted a half ton Ford with an automatic and a V-8 so it didn't matter much to me.
Thanks again.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
390 or 360?
Aint it funny how they all become 390s at selling time, I think.
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John
jowilker email me
[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
http://www.clubfte.com/users/jowilker/USFlag.gif
John
jowilker email me
[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
