Baffled Valve Cover Grommets. I have the stock PVC and breather. Mr Gasket Baffled Breather Grommet 2 Piece.
Gasket Baffled Breather Grommets Black. 29 out of 5 stars. Last time I chose a Summit brand grommet that also had a foam cylinder that you stick in the breather going into the grommet and this seemed to help a little more and the Summit one is cheaper.
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Only 2 left in stock more on the way. Ideal for those using aftermarket valve covers without O. Outside Diameter 1 in. Fits all original aftermarket aluminum chrome polished aluminim etc.