HELP... Constant coolant puking from bottle at higher rpm only

[Lifsvr7]

Ok, so kinda started in the winter, noticed that it took a really long time to get heat after warming up for 20 mins... about 2-3 miles before heat... Eventually wound up changing thermostat... still no real change... but lately I've been adding antifreeze like a maniac... At idle, or low speed, truck is fine, doesn't overheat or puke antifreeze... However higher RPM or driving at highway speeds eventually pukes out the antifreeze, and truck gets hot, gotta pullover, and wait, bleed pressure, and add more... it does seem to have excessive pressure in bottle... dunno where to even start with this....
Last year Feb, I had black onyx gaskets installed, Heads were checked, Truck was studded, Sinister Full delete with up pipe, New oil cooler... changed thremostat this yr...

[PowerstrokeTech82787]

im going to teach you how to test for bad head gaskets.

go get a brass T 3 nipples, 3/8s vacuum hose, a 0-30psi gauge, hose clamps, a tire valve stem a drill a die and a tap. Drill into the center of the T thread the hole, thread the brass section of the valve stem, put some teflon tape on the threads, thread in the 3 nipples, teflon tape on them, the Top nipple put the 3-4 foot long section of the vacuum hose clamp all the hoses, take the hose going to degas bottle off put 1 end of the t fitting on and cut a 3 inch section off the vacuum hose you bought and clamp it to the other nipple and to the degas bottle. Run the hose up the corner of the hood, put a tire chuck on it back off when it hits 16psi close the hood let it latch one step dont slam it shut, take the gauge into the cab fire it up go up a hill or on a long straight and hold it wide open. If it builds over 17psi bad head gasket.

[Lifsvr7]

yes, but not even being a year? less than 20k miles?? I don't beat my rig, I run around on a mild street tune. I tow a 6k boat no more than 30 miles at a time, no grades, less than once a month.

[verotik]

Originally Posted by Lifsvr7

yes, but not even being a year? less than 20k miles?? I don't beat my rig, I run around on a mild street tune. I tow a 6k boat no more than 30 miles at a time, no grades, less than once a month.

yes even you babying your truck!

[Lifsvr7]

Originally Posted by verotik

yes even you babying your truck!

imma check that out... it jus puzzles me, that even after fixing all the "problem" areas of the truck after 20K miles the gaskets would blow?? I mean WTF? really?? you would think it would last a little bit right?

[Lifsvr7]

dunno if it matters but first starting, there is NO blowby coming from the degas bottle... had cap off put hand over and felt nothing...

[dleopard19]

theres no coolant in your oil is there? and ive read where the black onyx head gaskets were not the greatest, ive heard motorcraft gaskets and arp studs are the way to go.

[Lifsvr7]

Originally Posted by dleopard19

theres no coolant in your oil is there? and ive read where the black onyx head gaskets were not the greatest, ive heard motorcraft gaskets and arp studs are the way to go.

Nope, no cross contamination either way... I had the studs & the stocks... I heard the opposite, and ppl swore by em, if you look at stocks they only have a VERY thin line of sealing material around all the jackets and cylinders... blew 4 cylinders, to point where truck was hydro-locking... I had heard that a screwed up water pump or possibly the oil cooler being bad again will also look like a head problem

[dazdillenger]

If it walks like a duck, and quacks like a duck.....

No heat+coolant puking under boost=headgaskets.

do you have a factory egr cooler?

[Lifsvr7]

nope... no cooler... studded... gaskets... supposedly fixed all our trucks notorious problems..