good point, stainless valves have thick margins, also more than just reseating them with new 45. they must be sunk back in head close to original valve installed height for ptv clereance that means the chamber now needs unshrouding for the larger valves to flow properly. dont think u will gain much over the valves u have now. as far as tb's gen 1 are most cluttered, gen 2 up throat dimensions different, main throttle blade milled down, they are fine, will make great street torque/accleration. cooper perf does all my machine work, he built a gen 1 3x4 2 years ago with stk tb's, that bike ran close to 170 mph in the 1/4 so tb[s not limiting factor on that bike. remove secondary rods, epoxy holes, good to go on street engine.
Last edited by gaz; 05-13-2018 at 07:14 AM.