I love W2 heads but I bought the wrong set at the wrong time. I bought them from a buddy after flowing them for him and him not using them. They were stock 3/8 valve (2.02) econo heads and hit 260 cfm at .450 and then dropped rapidly. I bought them and when researching them found that particular head was prone to cracking. At that point I knew I wasn’t going to put a lot of money (or time) in them so I found two set of rockers (Mopar performance and Crane) and found and ported a W2 Victor intake, and ported the heads quickly to around 305cfm, and with a Racer Brown .520 lift solid cam ram 9.80 on BP93 pump gas 408. Loved those heads but shortly after they leaked slowly as I heard they would. KD block sealer got me 2-3 years out of them and they leaked again. I was done with them at that point and sold the intake and rockers. Great head, heavy head, let me say that again, heavy head and I’m to old to lift heavy heads. Even great heavy heads. I bought one race set after that for a good deal with Norris rockers and sold them for a little profit. Love to help you and see what I could get out of a set with a 2.08 valve but I can’t. I fell in love with that short turn the first day I touched it.