Since this is a cool thread, I thought I'd bring it back up with a set of old iron I'm puttering with. These are some old 906's I'm going to try to resurrect. First job is installing step guides for the smaller stem valves. I'm waiting on valves, so I'm just doing spring pads and guide install for now, I'll do the VJ when I get the valves in. 5/16 intakes and 11/32 exhausts. Yes, the heads are still scuzzzy, that's by design, going into a bit of a sleeper setup. S/F....Ken M