[dsraven]

Motion racing has a decent article on the steam ports and why you need them. Some will say route them to the water pump housing but that simply returns air back into the system. You dont really want that. Air equals a bubble which can mean pressure build up since air is compressible and expands when heated causing more bubbles. Air also doesnt absorb heat like coolant does so there is a chance that bubbles can cause hot spots around cyl heads which can cause detonation and other things that can cause catastrophic failures. If coolant cant touch metal it cant absorb the heat. Air bubbles take up real estate that the coolant needs. Best to vent all 4 corners of the engine if possible to get rid of bubbles. Some intake manifolds are pretty tight to the valley so that makes it hard to accomplish. Also, vent the steam lines in a "always uphill" run if possible ending in the rad near the rad cap so steam and pressure from the steam venting can get out past the rad cap. Just dont connect to the rad cap vent line, lol. Some rads have a hose connection near the cap and some dont, if you are buying a new rad.