Valve Covers Chevrolet Big Block V8 396-454-502 Motor with 1 hole 1-1/4" for Breather or Pcv. OEM Height. Sold as a pair. Chrome Steel Baffled. Grommet Kit comprising 1 Pcv and 1 Oil Cap Grommet, is our Part No 66-520. Most Oil Caps with 1" Neck will fit such as our Part No's 66-012 and 66-013 Dome Style or 66-001, 66-002, 66-003, 66-044 Pleated Filter Style . Use Reusable Valve Cover Gasket MAG454G.