Billet aluminum, compatible with Chevrolet SBC BBC 350, 366, 396, 402, 427, 454 and Ford 260, 289, 302, 351W, 390, 429, and 460 engines.
New, installed once on a fresh Chevy 350 on the engine stand. Never used.
Note that center-bolt valve cover applications on 1986-up small block Chevy heads require a JEGS-type bracket set. Click the "more ads by this seller" link to see the brackets.