Anybody know of a reason I should NOT use two rear lids?  I've read until my eyes are red.  I want the front and rear to use the short valves like I bought from Ztherapy. Tired of fooling with them and was about to drill the longer fronts when I remembered my extra set of carbs. Switched everything around and I can't see any difference except they both have "R" stamped on them. Please tell me if I'm overlooking something.