OEM main cap fasteners on the Ford Modular V8 early aluminum block are a compromise -- adequate at stock power levels, but the first thing to become a liability in a serious build. ARP's 156-5001 replaces them with 8740 chromoly bolts rated to 180,000 psi tensile strength, with threads rolled after heat-treating for dramatically better fatigue resistance than pre-heat-treated alternatives. Precision centerless-ground to Mil-S-8879 specs with a black oxide finish for corrosion resistance. Side bolts only -- designed specifically for early aluminum M8 production engine blocks.

ARP 156-5001 High Performance Series Main Cap Side Bolt Kit Features:

• High Performance Series main cap side bolt kit
• Ford Modular V8 early aluminum block, M8, 4-bolt main application
• Fits 1996-2005 Mustang GT, 1996-2004 Cobra, 2003-2004 Mach 1
• 8740 chromoly steel construction
• Black oxide finish for corrosion resistance
• 12-point head style
• M8 thread
• 180,000 psi tensile strength rating
• Threads rolled after heat-treating for 2,000% better fatigue strength
• Precision centerless-ground to Mil-S-8879 specs
• Reduced wrenching head, large underhead radius
• Hardened parallel-ground washers included
• Nuts included
• Windage tray: not compatible
• Side bolts only
• Sold as a kit