Add to Favorite Sellers. 241-83 Holley M/T Valve Covers – Vintage Style – Finned – SBC – Satin Black. Chevrolet Small Block – Perimeter Bolt – Cast Aluminum. Precision manufactured with knock-out plugs for stock PCV (smog Control) and oil fill installations. Top cover surface may be used for engraving your name horizontally. Deep heat dissipating fins. Cast aluminum construction for even gasket sealing. Customer Service & Feedback. So we have a chance to make it right – we want your repeat business! Check out the official Holley Performance. For more great deals!!