Could anyone out there tell me the correct size of the water drain plug on the TR6 block (right side, directly over starter). Mine has some bizzare plumbing which entails a hose coming from this drain and then 't'ing into the front manifold hose behind the thermostat housing. I want to do away with all that. I know there may be a reason why it was done that way, but I want to try it anyway. It may have something to do with the fact that when I got the car it had neither the rad shroud or a thermostat. Thanks.