Join Date: Jan 2006
Location: 1231 Upper Trace, Owensboro,KY 42303
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Good question and some of us are working on it.
1. Randy Malik converted one to a 4500 Dommy, by machine work and redrilling the pattern. IMO the carb pad walls are thin after you do this, because the carb pad was originally intended for the 4150 square bore only, and the sealing surface is marginal.
2. Jet Boat Bob used two spools of wire weld to build up the outer walls of the carb pad for a R&D TFS manifold I've got here now, in order to convert to 4500 Dommy.
3. Ron G. has machined a prototype at TFS and it's being digitized now,,,,tenatitive plans are for a TFS 4500 Dommy manifold sometime in the future. There's stilll flow testing and dyno testing to do, in order to prove the piece, so don't hold your breath.
Hope this helps,