am about to go efi and up the power at the same time and wondered who in your own opinion does the best up-rated ported and polished head and any prices if known. i've heard good things about cylinder head developements/norris heads and does it need bigger valves as seems to be a bit of debate on valve sizes and compound they made of, thought i'd see what you all got to say on matter (it's efi head by the way)