hello my names Yasser im new here and dont know much about Toyotas but ive been offered a Starlet GT Turbo by my mate but theres a big oil leak from the Camshaft seal, hes had a new head put on the engine and had it rebuilt as he blew it, they put a new seal in but its leaking and hes not sure whats causing this to happen anyone know what it could be? i think it maybe that the head would need skiming or something like that? thanks for any help Yasser