I have a 1992 f150 custom 6-300 4.9l that i need to replace the engine in. The help i need is i can't tell if it's the one with air in head or air in manifold. Can someone tell me what to look for or send picture please?

 

Follow the outlet pipe/hose from the air pump - where does it go?

 

glc i follow the outlet hose from the air pump and it goes under the engine somewhere.

 

If it goes into the head, then I'd assume its air in head. If it's air in manifold, there will probably be fittings and pipes coming off the manifold.