Suit SB/BB Chev (With 2-Piece Main Sel) SB/BB Ford & Holden V8 7/16 In Thread X 1 In Uhl. ARP Replacement Bolts Are Forged From Aerospace Alloy And Heat Treated Prior To Thread Rolling And Machining. With An Exclusive Flat 12-Point Head Design And Larger Than Stock Shank Diameter These Bolts Deliver Increased Strength And Improved Flywheel And Flexplate Retention. Rated 170000Psi (High-Perf.) And 190000Psi (Pro-Series) Tensile Strength. Set Of 6.