rtv around the pcv valve
ok I'll do that and get back with u.My car did this when it had serious blow by(multiple cracked piston ring lands). I put some high temp silicone tape around the pcv grommet to make it an extremely tight fit, this helped with it not blowing the pcv grommet, and valve out. However the oil started blowing out my dipstick tube. Tried breathers just blew oil out of them as well. Do a leak down test if you can.
YesDo you still have the vent tube between the filler neck and TB?
Just went and pulled the breather cap off the filler neck and vapors are definitely blowing out. What are my options@Bretts0032
Your difficulty is indicative of some fault allowing very high crankcase pressure build-up, as mentioned by @jchav02. This is not a good scenerio, but is partly good in that it develops only at high rpms. Cause(s)? As he said, or cracked piston rings, cracked piston, small hole in piston dome.
With engine idling, remove oil filler cap and listen carefully at opening. If a rushing, whooshing sound is audible, or vapors are felt coming out, continuing to drive it will only make it worse. Sorry. imp
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