i see thanks fellas.
how can you be totally sure the hg is 100%?
my engine might have puked once after egr delete and a coolant flush. after that ran a pressure gauge off the overflow line from the degas and never hit over 12 psi. stomped on the go pedal several times since and havent puked. for some reason my fuel mileage decreases by 1-1.5 mpg on the 300 hd in 100* heat.