mleach72
Well-Known Member
BDM was assembling their own motors in-house in '05 and '06. They used TP rocker boxes instead of S&S boxes. Why? I don't know. Some say the TP's don't produce as much engine noise. Engine noise was also a part of the new epa laws that came down in the mid-2000's. There is a geometry problem when using TP's on an s&s engine that has the potential for premature valve guide wear. Some have had problems. Others have not. There are many threads on the subject. Just do a search.