Engineered for function and styled for good looks, triple chrome-plated Signature Series valve covers have stock-style breather baffles that prevent oil passage to the PCV valve. These quality valve covers accept all emissions equipment, including PCV valve. Rubber grommets for the breather and PCV valve holes included. Matching breathers sold separately. NOTE: Tall Profile are 1-1/4" taller than stock, and clear most roller rockers and valvetrain components. Low Profile valve covers clear air-conditioning and alternator brackets. Tall profile valve covers will not clear stud girdles. Signature Series valve covers clear most aluminum rocker arms and moderate lift cams Edelbrock Signature Series Valve Cover 4485 Olds 350-455 - 5- and 10-Hole Heads - 2.9 in. Overall Height - PairTriple Chrome-PlatedAccept All Emissions EquipmentAccept PCV ValveIncludes PCV Valve HolesRubber Grommets For BreatherApplications include: 442, 98, Bonneville, Catalina, Century, Custom Cruiser, Cutlass, Cutlass Calais, Cutlass Cruiser, Cutlass Salon, Cutlass Supreme, Delmont 88, Delta 88, Dynamic, Electra, Estate Wagon, F85, Firebird, Firebird Trans Am, Grand Lemans Pit Stop USAoffers Edelbrock Signature Series Valve Cover 4485 at low everyday prices. Be sure to check out all of the products from Edelbrock including Edelbrock Engine Parts and Accessories, Edelbrock Valve Covers and Accessories, Edelbrock Steel Valve Covers - Oldsmobile.