Suit SB/BB Chev (With 2-Piece Main Sel) Sb/Bb Ford & Holden V8 7/16 In Thread X 1 In Uhl. These Pro Series Flywheel Bolts From ARP Give You All That You Need To Bolt In Your Flywheel With Confidence. They Are Much Stronger Than Oem Hardware Are Forged From Aerospace Alloy And Are Heat-Treated Prior To Thread Rolling And Machining. These Bolts Feature An Exclusive Flat 12-Point Head Design And A Larger-Than-Stock Shank Diameter For Increased Strength And Improved Flywheel Register.