ARP offers High Performance Series bolts that are made from a premium grade chrome moly and hardened to a nominal tensile strength of 180,000 psi. The Pro Series bolts, originally developed for NASCAR competition, are rated at 200,000 psi. Both models feature a large diameter, low-profile head design. Complete with washers, where applicable.

Product Features:

• 1/2" 12-Point Socket Size(s)
• 8740 Chromoly
• Black Oxide
• 1985 & Earlier Ford 289-460 V8
• 5/16"-18 Thread Size
• 200,000 PSI
• 0.78" Underhead Length
• Sold As A Kit