ARP 156-5401 Main Stud Kit for Ford Modular 4.6L/5.4L Iron 2-Bolt Main Blocks

Vehicle Fitment

• Ford Modular V8 4.6 L & 5.4 L cast iron engines with 2-bolt main caps - engine blocks without factory windage tray (e.g., Mustang GT, F-150, Navigator, Lightning, 03-04 Cobra)

Features

• Constructed from high-strength 8740 chromoly steel for durability
• Rated ~190,000 psi tensile strength for maximum reliability
• Precision centerless-ground studs with thread-rolled, Mil-S-8879 spec finish
• Black-oxide coating for corrosion resistance and engine bay appearance
• Complete kit includes hardened washers and high-strength hex nuts
• Prevents main cap walk/fretting under performance and high-RPM conditions
• Reusable design - superior to OEM torque-to-yield bolts
• Perfect for performance builds where bottom-end stability is critical

Specifications

• Material: 8740 chromoly steel
• Tensile strength: approx. 190,000 psi
• Finish: Black oxide
• Kit includes studs, hardened washers, and hex nuts
• Compatible with cast iron 2-bolt main blocks without windage tray

Included Components

• 1x complete set of main studs (quantity per block according to engine specs)
• 1x set of hardened washers
• 1x set of high-strength hex nuts

Product Description

The ARP 156-5401 Main Stud Kit is engineered for Ford Modular 4.6 L and 5.4 L cast iron engines with 2-bolt main caps and no factory windage tray. These premium studs are crafted from aerospace-grade 8740 chromoly steel, heat-treated and thread-rolled to provide an exceptional tensile rating of around 190,000 psi. The kit includes precision-ground studs, hardened washers, and high-strength hex nuts, all finished in black oxide.

This kit is ideal for high-performance applications, especially where main cap walk or bearing cap movement is a concern under high RPM or power levels. ARP studs deliver a reusable, high-integrity solution far beyond the stock torque-to-yield fasteners. Check fitment carefully - this kit is not compatible with aluminum block variants or blocks with windage trays.