OLDSMOBILE 5/16 BY 5/16 CAST IRON HEADS GUIDE PLATES 330,350,403,400,425,455

OLDSMOBILE 5/16 BY 5/16 GUIDE PLATES . THESE GUIDE PLATES ARE A MUST WHEN ADDING AN ADJUSTABLE ROCKERS TO CAST IRON HEADS . THEY ARE A DIRECT BOLT ON TO ANY OLDSMOBILE CAST IRON HEADS .THESE GUIDE PLATES WILL WORK WITH STEEL ROLLER TIP ROCKERS , ALUMINUM , AND PRO MAGNUM STAINLESS STEEL. THESE GUIDE PLATES ARE HARDENED AND REQUIRE HARDENED PUSHRODS .