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Message: [QUOTE="TooManyToys, post: 1529994, member: 30841"] Your story is similar to akblackfoot's on FTE. Rebuilt and modified power motor that would develop high pressures, but [U]no puking[/U]. Removed EGR, etc. His shop tore the motor down and the gaskets were fine, so no combustion gas getting into the coolant system to puke. The solution was to add the coolant recirculation kit that a few vendors offer. You drill and tap into the back of the heads, and the coolant lines run to under the thermostat housing to return. One person on the forum who I respect believes it moves more coolant through the head. He might be right, but I believe it removes trapped air at the back of the head. The heads are manufactured for placement on either bank, but in doing so there is an area that can be problematic for trapping air. The engine manufacturers deal with this type of situation all the time, it's why were have a bleed to degas at the intake manifold and at the radiator top tank. My Lincoln LS 3.9 is a nightmare for this issue. I was skeptical about this, but it worked for akblackfoot. Then since my motor is apart I kept looking at why it may have worked for him. My heads are tapped for these, but I'll do my own "kit", and may just return the coolant to the front of the heads. But I'm going to use a smaller line, probably 3/16" tubing as I believe it's just venting trapped air. That's why I earlier asked about pressure hot and cold, but in reality, your test run may be a better proof of the situation. It will become a video for me sometime, but here is how the heads with my fitting looks. I've got a preliminary video, but I don't think of much use right now. [/QUOTE]