where is the oil fill cap for a 1978 ford 400ci f150?

[hatchetscout]

not firmiliar with old engines. there is no "marked" cap. and i dont know where it would be...

 

[avomatic]

valve covers, it will be a silver metallic cap, you may actually have caps on both valve covers, some models do not have an actual cap, you have to remove the valve breather filter and fill trough there, love old tech.