Pic at end of post
It was plugged off and that plug was broken when I redid the head. I now realize this may be why I blew that head. The side port is part of the water system, that hose coming down is from the heater core. Where should the hose that wants to be where the cap is go to?
If you don't know where the hose should lead to, do yo know what kind of cap I can get that won't give out from the heat? I feel lucky this happened right when I got home and stopped. The intermittent wiring fault to the dash was on and I had no temp gauge this morning.
The cap been on about 3 years but I have driven less than 2K miles in that time so its not like it was going to work out for me if I had started using this daily. I got these caps at Knecht's and they are supposed to take the heat. I'm thinking they must make caps out of pure silicon, anyone know where?

Water port on Intake.jpg