I dont quite understand what you are asking. If you want the overall lengths of valves, they are as follows, inlet/ 105.68mm and exhaust /105.5mm. Spring lengths are given as 23.45mm ,valve open and 32mm valve closed. Free spring length is given as 39.8 mm. Head diameter of ex . valve is 31.0-31.2mm and inl. valve is 35.0-35.2mm. Stem diameters are , 6.970mm/6.955mm for inlet and 7.960/7/938mm for exhaust. Hope this is of some help. This info is given in The Story of The Ford Sierra RS Cosworth. It can be obtained from www.cppress.co.uk I dont know the price but it is full of engine data. I live just up the road from you so you could contact me on 02392 259358 if you need further info. My name is John. My 3 Door is with Tremona garage at the moment for a total engine rebuild. New bits so far £3800!!