I have a 1986 ford 300 six with clifford water heated manifold,650 edelbrock carb,dual clifford headers,crane cam and lifters and have ported and polished the head,I am about to install forged rods and pistons as I have a nitrous kit I want to put on it.To get the compression I want I need to know the cc's of the head,anyone know how many cc's in ford 86 head combustion chamber?????....jimmm