Head Casting Numbers Question

Pull a valve cover and the casting number for the head will be on one of the intake ports.

I would recommend using a dual plane intake over a single plane. They will work better for a truck application. Stick with the one that's on there.


If your heads have the space for the smog holes, but they are not drilled, then I would say your heads are no newer than 77 as I know 77's had the holes drilled. Your heads will work fine for you.