I've been looking for a Alum. valve cover for my 1978 I6. It seems as if all I see are ones for 1981 and above, although the valve cover gasket fits just about all years --one part number. So, what is the difference??
i do believe you need to drill and tap a hole or two to use them. Been awhile since i read a thread about it. From my understanding its not a difficult task. Might do a search. Am sure there are some here somewhere
The design of the head changed in 1980, the 1980 and up valve covers will fit on your '78 head but you're going to have a very diffcult time getting it to seal correctly.