Cheers for reply it's defiantly big valve head ported and matched as I've had head of a few times and they are no way standard valves the stems have been machined down at there neck spoke to pe and managed to spoke to Ian who originally built these engines they cannot supply them but can put me in touch with company I'n Guildford that cAn make some so it's not to sad gonna get head of Thursday and see how many are bent and give him the numbers off them