Aluminum cylinder heads

318willrun said
LA heads can be run on a magnum. Some earlier magnums have the oil passage for the rockers already present, just need to change the cam bearing. Others, you could jig and drill that passage, or have a machine shop do it.

I have a late 91 magnum and a 94 one, both have the passages I would assume that 91 thru 94 blocks have the passages