DT WB not with us but Frank made me feel stupid enough when I asked him about it. " How can you have messed with Hemis since 1970 and not notice this?" "Haven't we taught you anything?" I would have walked away but we were half way between Atl and Indy and Frank was driving. Frank had fun with this. Back home now and about to go to the shop and I am going to take a CLOSE look at the heads and see what I have missed all these years. Maybe I knew this once and just forgot.