Chevrolet Repair: Heads, oxides of nitrogen, chevy k1500

Question
I have a 1994 chevy K1500 with the 5.7L 350 TBI and i have large amounts of steam comming from the exhaust not sure why i thought the heads were cracked so i took them off there is nothing visibly wrong with them any ideas

Answer
In physical chemistry steam refers to vaporized water.  Water is a byproduct of perfect combustion.  The closer to a stoichiometric fuel ratio with the proper emissions equipment installed will produce Hydrocarbons, carbon monoxide, oxides of nitrogen, oxygen, carbon dioxide and H2O.  Water.
 White smoke on the other hand could be coolant, brake fluid or transmission fluid.  A leaking master cylinder seal can cause brake fluid to be drawn up by the booster and then sucked in by the engine and create smoke.  Coolant cracks in head, water jackets, head gaskets intake etc etc etc.  A leaking modulator valve on a transmission can also cause white smoke from transmission fluid being drawn up a vacuum .ine.

 At this point you are best to send the heads to a machine shop to be pressure tested and planed.  Bolt everything back together and take a good look at your old intake gaskets.  Take a close look around the sealing rings of the headgaskets and ports too. You must have missed or overlooked something.

Wayne