I have a 2006 F250 I just replaced the head gaskets, and did the studs also. I had a Ford Tech do the job on the side 2 weekends ago. Truck runs excellent. When he checked the heads he stated that the heads were warped about .002, but within Fords Spec. We used Ford OEM gaskets, and replaced everything else that needed replacing while in there. I have a PSI guage on the coolant system, and it runs between 12 to 13 PSI under load, and never goes above this. Before the head gaskets were changed, the PSI would rapidly spike to about 17 PSI, but I never noticed any puking from this truck. I've always noticed this hoot noise on acceleration and deacceleration from 1750 to 2200 rpms. I removed the coolant cap from the degas bottle and ran the truck around the block and noticed it still makes this hoot noise. The noise seems to be coming from the passengers side of the truck under the hood, but I can't isolate where the noise is coming from. Truck runs excellent with plenty of power. I can't seem to find a definate answer on where the normal coolant PSI should be while running the truck under normal driving conditions.
My video of myself diagnosing my truck with bad head gaskets.