The "Engine builder" valves are no longer available. The owner of the company retired. Over sized valves are available, but I'm not sure of the actual over size, or stem length. My head was set up for these valves. I had one head that had Manley valves, and two valves were hurt. Sent a sample vale to Manly and got one each exhaust and intake as replacements. Made the mistake of not getting a price quote. The two valves cost over $100 and took 4-5 weeks for turnaround Could have done a full set of the Engine Builder valves for less money..
