Hi just started it up the first this year when itso when it was warming up I smell oil it is on a 81 Ford e 350 with 460 how hard it to replace the valve gasket s
Check to see if all the valve cover bolts are tight. I had an 85 that both valve covers leaked when I got it. After finding all the cover bolts loose and tightening them, no more leaks.
Also, check the valve covers to make sure they are flat, if not lay it on the flat edge of a table and hammer it flat. That is a cause of leaks at times.