Thanks guys! I have .240, .280 and in between venturi here. I thought .240 was correct but it was 20+ years ago when I last used these engines. I really enjoyed QM 15 too ........

In another thread, I see where there is potential to change Q500 rules once again ..... and I have drawers full of still good but old engines that were once competitive in various classes. Rules changes are certainly nothing new and it always cost $$ to stay current and competitive. When I saw the LS Nelson come out .... all I could think was here they go again.