LMDNC5

what is the reason for eliminating vacuum hose from throttle body to passenger valve cover pcv system done when supercharger was installed it is an A/A V2

corvettebob1

Because when you go into boost the TB becomes pressurized which would in turn pressurize the crankcase, and more then likely blow out the seals.

LMDNC5

the problem i am having is oil blowing out blow off valve. This happened running a very tight low speed auto cross and never getting out of first gear also i am running a 4:10 gear so RPMs were high for entire run. engine runs great and boost seems good with no unusual noise

ysb02

You might want to do a catch can setup