The revised Vented oil fill cap helps in some situations when used with the newer valve design, It helped on mine when I had a pcv system..
The Vented oil fill cap is gm part #12589430
And fixed orfice pcv valve is gm# 12572717
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
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