THESE BILLET BOLT-ON VALVE COVERS WERE DESIGNED FOR HIGH PERFORMANCE 36 H.P. OKRASA ENGINES THAT REQUIRE CLEARANCE FOR HI-LIFT ROCKERS. EACH SET IS MACHINED FROM BILLET 6061 T6 ALUMINUM, POLISHED TO SHOW QUALITY, AND COME WITH STAINLESS STEEL BUTTON HEAD BOLTS & WASHERS IN THE BOLT-ON INSTALLATION KIT. THESE ARE PROUDLY MANUFACTURED HERE AT OUR MACHINE SHOP IN SANTA FE SPRINGS, CA. 21-1865