Lol... water boils at 212°F. Put some coolant in it before you destroy your new engine.
Check your tail pipe for excessive water. Should be some from normal burn but you didn't say how much water was disappering. You need to be running coolant from the get go. There is K-Seal stop leak additive for the coolant to stop head leaks like you've discribed..
Could be that it is just straight water, the milky ness probably is you done a good system flush.
I have also seen a lot of times the radiator cap was bad... Check it by squeezing the hose it should not be open.
So me and my dad just installed a new 355 short block in his 97 lt1 after spinning bearings on the dyno last year from a cam install( found out it had rtv in the oil pickup tube) we havnt ran coolant, just water because its may and dont want to waste coolant if we have to take it apart gain, after days of tinkering we finaly get it to run perfect and put about 100 miles on it. We start noticing the water disappearing in the radiator and whats acualy in it is milky but not thick, oil looks the way it should and its not over heating at all, we did a pressure check and left it over night and the needle didnt move at all, could this be a head gasket? We did the whole build the way your suposed to, proper torque spects and torque paterns on bothe heads and intake and primed the engine prior to instalation. Also coolant only disappears when driven, not parket, and it doesnt smoke which it shouldnt anyway since were only running water and no coolant whatsoever, please help, we dont wana pull the heads off because thats a pain in the *** on 4th gen camaros
