55 F100 engine ID

[dmsfrr]

Originally Posted by Daves55Sedan

It has always been my understanding that the 239 Y-block was first used in 1954 Ford cars and was used in 1955 Ford F100 pickup trucks, ...

Yes, that's what this chart shows.
http://ford-y-block.com/Block%20identification.htm

EBU 239 cu. in. V8 1954 cars only.
EBV 239 cu. in. V8 1955 pickup

Originally Posted by tommyleea

So, what engine do you think SHOULD be in my truck?

If more than a few sources for 50's Ford truck information agree that a V engine code in an F-100 truck serial number for 1955 is a 239 engine, and there's a V engine code in the serial number of the '55 F-100 you have, then that's what it left the factory with.
There may have been an optional 272 engine available in some '55 trucks ? (ECG 272 - 1955 to 57 cars and trucks) but the truck would have a different engine code letter in the serial number.

Given the lack of regular maint that many work trucks suffered and the 63 years since then it shouldn't be at all surprising if the engine has been changed.
Example: my '55 Bird project seems to have had 3 different engines before I got it and was put together with 4+ different years & models of parts under the hood. It now has its fourth engine.
.