Found my old W2 heads I bought from friend in 2002. '810 castings from late 1970's (I believe) ported in NN VA before I bought them. Researching W2 historical stuff showed many different versions. A lot of confusion! Here's my heads which "appear" to have never been bolted on. Ported with 2.08 intakes, 1.60 exhaust. Maybe thread can contribute to knowledge here of W2 head versions, or not. : )