Hey all, new to the board. I have a 76 F250 hi-boy, which is pieced together to say the least. Not sure if I have the 360 or 390 mill. The guy I bought it from said it was the 390. The carb spacer on the intake is for a 4-barrel, with an aftermarket carb. I heard that only some of the 390's came with the 4 barrel. The question is what is the intake on this motor? Is the intake the same for the 360 and 390? Is it the same for a 2 or 4 barrel? Is it possible that the intake is for a 2 barrel 360, with a 4 barrel carb spacer? Also, what's the best way to find out if it's the 360 or 390? Any and all help would be appreciated, as I'm a newbie to these Fords. Thanks.

 

You'll need to describe the intake more, find casting numbers if possible.

I'm not sure they ever put 4V setups on 360s, but I also beliveve that there are few if any factory 4x4 390 setups.

The bets way to determine if you have a 390 is to measure the stroke or ID the crank. Do a search in this FE forum to find several methods of measureing the stroke.

Now , with the age of these trucks there is often no telling what somebody else has put in the truck.

I think the 2V intakes have a smaller intake opening, so it would require an adapter for a 4V carb on a 2V intake.

 

No 4-barrel 360's
No 4x4 390's
You can use an adapter to put a 4barrel on a two barrel intake, but it doesnt work very well.
Intakes interchange.
Gtex is right, these old trucks can and more often than not do have anything.