Hi gang, just did a rebuild on the 5.0 last week. Had to replace the head gaskets for a leak, and add some other goodies that I had been waiting to do for a year now. Now I got my 30# injectors and mass air flow paired up, and the Trick Flow Track Heat set up is running great. Only hang up, I can't seem to get all the air out of the cooling system. I have installed a high flow aluminum water pump, new motorsport silicone hoses, and an electric fan with thermostatic control. However, upon warming the car up, trying to get it to operating temp, btw thermostat is 180 degrees and is the one I have been using for the last year and was working last week, I build pressure in the system and eventually start spewing coolant out of the funnel I have on top of the radiator. It acts like a huge air pocket is trapped in the system. If I plug the funnel, wait a few mins, the pull the plug, the coolant is sucked back in. I think the thermostat isn't getting a chance to open before the coolant in the radiator gets too hot. Anybody got any tricks for speeding the process up? I usually never get these problems on the imports I work on, and I don't recall having this much trouble last year after I did a rebuild. Thanks for your help.