SKU: ARP134-5202
UPC: 672036001865
MPN: 134-5202
The ARP SBC Main Bolt Kit for 4-Bolt, Large Journal, 6-point is a chromoly fastener assembly engineered for small-block Chevy engine builders and performance enthusiasts. This main bolt kit delivers the fastening integrity required for high-RPM applications and nitrous oxide systems where standard factory bolts reach their service limits. ARP's High Performance Series main bolt kit uses 8740 chromoly alloy with black oxide finish to resist corrosion and fatigue failure under extreme engine loads.
The 4-bolt main configuration with large journal diameter is the standard for classic small-block Chevy platforms where factory cast-iron bolts are prone to stretch and failure in forced-induction or high-compression builds. ARP's chromoly composition increases tensile strength significantly compared to OEM hardware, and the black oxide coating provides oxidation resistance in engine bay environments. The 6-point hex head design ensures positive engagement during installation and service, preventing rounding damage common with lower-quality fasteners during torque procedures.
Engine builders, machine shops, and serious track enthusiasts select this bolt kit when rebuilding or upgrading small-block Chevy long-blocks intended for sustained high-RPM operation, boost applications, or competitive endurance racing. This kit provides the dimensional and material specifications necessary for engine block retention on vehicles where failure is not an option. Proper installation requires torque wrench application to manufacturer specifications and ARP assembly lubricant for accurate preload.
ARP main bolt kits represent the industry standard for upgrading factory fastening systems in performance small-block engines. Original equipment hardware on classic platforms was designed for stock compression ratios and moderate power levels; modern builds routinely exceed these limits, making upgraded fasteners essential for reliability and longevity in competition or daily-driven high-power vehicles.
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