I had a head pressure tested once @ the machine shop & fluid was leaking every where like a tiny sponge. Aluminum gets porous over time with the heating & cooling & especially if its ever gets overheated. Coolant will pass through these pores real slowly & you sometimes just burn it. Just a thought to ponder. <img src="/forums/images/graemlins/cheers.gif" alt="" />

85 4runner, 22re,cam, headers,2.25free flow exhaust,3"susp lift, 33's,custom bumpers,& stuff