I went through this a while back. Couldn't find an of the shelf part that suited me. Alexsparts.com has stainless 427 LR valves for $159.95 shipped. That's intake and exhaust. I'm sure they're imported but they seem pretty decent. The intakes are 2.25 with a nail head. I turned .100 off the OD and ground the 45. I think they had a 30 to start with.