That is nothing compared to what the guy did in the eighties. I asked him to mill them fourty and put 2.02s in. He must have put the valves in first. He milled one fourty with valves in at the start and shaved two intakes. I replaced the two valves and put the heads away until recently. When I started measuring I found one head milled about fourty and the other twenty. It’s all good now with cc’d even at 63 after unshrouding the valves and flowed 261 at 500. His valve job was redone by a pro.