How do I tell if the engine I have is the windsor or the cleavland in my 91 f-150 4x4? Also what is the difference?

 

The Cleveland is the better of the two motors. It is usually the one used for high performance vehicles. I am not exactly sure how to tell, I think that it has something to do with the number of valve cover bolts you vehicle has. I would be willing to bet that the powerplant in your truck is a Winsor.

 

if it is the orginal motor and EFI it is a Windsor. A cleveland is a big block, and hasn't been avaiable for some time now.the 351 windsor is a small block closely related to the 302.

------------------
2001 F-150 XLT S-CAB 4.6 "the full ride"
96 Taurus GL
93 Kenne-Bell Supercharged Mustang
"Injection is nice, but I perfer being blown!"

 

Look at the thermostat. The thermostat in the windsor attaches to the intake. In a cleveland, it goes directly into the block.