Thanks to everyone on the cam response, sounds like we drew a good issue to talk about,I will take your ( the group) advice and run with it. It is great to get good feed back from you, as I do have a "Larry Young" and a "Erson" for my TR-4 but you don't find the GT-6s talked about much or advertised and this motor turns higher than a "six". -- rob deanes TR Racer