There are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. All kits come complete with hardened parallel-ground washers and high quality nuts.
Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place. The studs are manufactured from 8740 chrome moly steel, heat-treated in-house to 190,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 2000% stronger than others.
- Main Bolt Style:
- 2-bolt
- Style:
- Stud
- Head Style:
- 12-point
- Works with Windage Tray:
- No
- Fastener Tensile Strength (psi):
- 190,000 psi
- Nuts Included:
- Yes
- Washers Included:
- Yes
- Material:
- 8740 Chromoly
- Finish:
- Black Oxide
- Quantity:
- Sold as a kit.
- Notes:
- Main cap number 5 requires machining 0.265 in. pocket for stud clearance.
- Make:
- Ford
- Engine Family:
- Ford big block FE
- Engine Sizes:
- 6.4L/390-7.0/428
- Years:
- 1961-1977
