How do I find out the exact engine I have in my truck? I do know it's an 8 cylinder but I don't know if it's a 5.0 or 5.2....It's an old beater 1989 truck that I bought for $800 that runs well and drive pretty good. I'm trying to get things repaired, replaced, and etc. I know I need to put a t-stat in it so the engine will warm up and the heater will work when winter comes around again.

This may be a dumb question but I honestly can't find any labels on the truck to tell me anything about it.

 

Isn't the displacement printed on the top of the plenum? I thought they either said 5.0 or 5.8 on the V8 trucks.

 

Like this...

 

If that's not on there, you could also use the VIN decoder: VIN Decoder - Ford Truck Enthusiasts Forums

 

No plenum markings except for Ford Motor Company.

Getting the VIN.

 

OK....got it now....302/5.0.....The VIN translator worked perfectly. Thank You.!!!

 

Awesome! You're welcome.

 

Some of the motors (like my 88 and my parts engine) do not say 5.0L on it it just says ford electronic fuel injection. I think this is only for the 85-89 trucks as our 90 F150 is like the one you posted, however the 86 F150 we had is like the one on my 88.
Trav

 

It was very unlikely to be a 5.2L since that's a Dodge engine. Ford never made a 5.2L.