Originally Posted by slick rick
Mine turned out to be the Oil Pressure Relief Valve
That's the oil pump bro!
I'd say its the pump as well.
01 Ws6, m6, ASC#618 of 1583,40k Miles,shortblock built by AES the rest built by me,Ls3 416,FAST 102, NW102,LPE Ls3 heads,LsR 243/259 .624 114+3 ,C5r T/c,all ARP'd,12-1 comp,morel L/b lifters,melling O/P, kooks 2" headers,FTP 104mm lid,JAAM RamAir Kit,PB 10% UDP,UMI K-member,UMI T/A relocator,UMI SFC's, UMI upper and lower c/a,SLP T/A,UMI LCA's,UMI adj. PHB,Racetronix f/p,sjm abs delete,katech tensioner, dhm dual cutouts,magnaflow CB,Koni adj shocks,BMR springs,Moser 9in w/35 spline axles,4.11's and spooled, viperized T56,tuned @Straightline's mustang dyno 545hp/524tq