New guy here w/ some ?'s.

I recently bought a 1980 F350 w/ a motor that I have some ?'s about.
From the #'s on the intake its from a '68 Thunderbird, the heads are from a '73 Lincoln and the block is from a '69 Lincoln and has 460 stamped on it. It has a Holley 4bbl also, seller said it was a 750?
I believe the heads and block are from a 460, but the intake is from a 429? Why would someone do this and are their any inherent advantages of the 429 over the 460?

I bought it from a gentleman that pushed snow w/ it. He bought it from a guy who also pushed snow, but also built race motors on the side.
Could someone please tell me what I really have and how about some hp/tq #'s. Also is there anyway I can tell if anything has been done to the inside?
It runs like a scalded dog and gets about 6-8mpg. Something else, is the front axle supposed to be a IFS on a '80 1ton?

Please bear w/ me, I'm a diesel head, and have no experience w/ gas motors. I can make a diesel purr like a kitten, but this thing w/ the carb has me asking many, many ?'s.

Thanks

 

Welcome,

I would not think there is any difference in the intakes. Other than the older one would not have the EGR ports.

Yes this truck would have the TTB ( IFS ) front end. It was a little later on that they put a straight axle under the 1 ton 4x4.

As for estimating power, its hard to say because of no knowledge of whats in it, part wise.

>>Also is there anyway I can tell if anything has been done to the inside?<<

It would require taking the motor apart to know whats in it. Maybe you can find the person who built it, to get some history.

 

Thanks for the reply Superdave. Its been over 10yrs since it was purchased from the engine rebuilder. It doesn't use any oil, just a few leaks, so its still in pretty good shape. I just need to get some carb work done to it.

thanks again

 

385 blocks were used by all Ford/Lincoln/Mercury divisions and I've seen several 429s with the 460 casting ID on them. Until you can see if the pistons are dished (460) or have one or two valve reliefs (429) or look at the crank number (the only true means of ID), it's almost impossible to tell a standard production 429 from a 460.

 

To find #'s on the crank: Are they internal? I looked between the crank pulley and the motor and there aren't any #'s.

The valve covers have 7 bolts holding them on, I think when searching that someone said that 7-bolt valve covers are from a 429? But when researching the casting #'s I came up w/ the heads being from a 1973 Lincoln, which I surmise had the 460(also from limited searching)? She's painted blue and the valve covers say "Power by Ford"
Also how can one ID the carb? Its supposed to be a Holley 750.

Thanks for the info guys and please keep it coming!

 

Crank numbers are internal, stamped on the smooth surface of a throw.

Seven valve cover bolts means 429 or 460. All 385 heads, regardless of casting numbers, were used on all 429/460s. Only real difference is the valve train, '68-71 used rail rockers and '72+ used pedestal rockers.

Here's a Holley ID chart:

http://www.holley.com/HiOctn/ProdLine/CarbList.pdf

 

80Ford, As georgedavila mentioned the numbers are internal. You would have to drop the oil pan to check the casting numbers on the crank.

So it would just be up to you, and how much labor you want to invest, to make the decision on how bad you want to find out whats in the motor.

 

Thanks again for the info guys!
I don't need to know bad enough to drop the pan, as it would require pulling the motor of dropping the front axle.