35.6mm inlet valve in EN52 steel.As it is possible, even common, to swap one head for another on 1275 engines, it is quite easy to become confused or worse yet confuse the parts-guy when it is time to order new valves. Be aware that if the head has been worked on previously it may have oversize valves, it may have undersize if seats have been installed. Unless you are 100% sure what is in your cylinder head, it is a good idea to remove a valve for accurate measurement. There are two lengths used (nominally 3.44" & 3.56") three different cotters, (wide, narrow, and three-groove) and many different head diameters. These valves are 35.6mm or 1,401" DIAMETER and were fitted in the MG metro. They are a super quality road valve and used by Minispares in their gas flowed road heads. These are A plus triple collet groove types and are the next size up to all the standard 1275cc inlet valves. Latest CAM head castings all use the these 3.56mm long valves.