Main Cap Bolt LS Series Inner 6-Bolt w/Tray Stud

The Chevrolet Performance Main Cap Bolt LS Series Inner 6-Bolt with Tray Stud (Part #12560273) is a precision OEM-specification engine fastener engineered for LS-series engine assembly and high-performance rebuild work. This hex-head main bolt is manufactured from steel with a black oxide finish to resist corrosion during engine break-in and extended operation. Designed specifically for 6-bolt main cap configurations, it incorporates a tray stud feature that integrates with the windage tray assembly—a critical component in keeping crankcase oil properly distributed during sustained high-RPM operation and cornering loads.

The bolt's dimensions (1.1 x 0.95 x 6.45 inches) and lightweight construction (0.14 lbs per unit) meet OEM tolerances for LS engine platforms including the LS1, LS2, LS3, LS6, and related variants. The black oxide surface treatment provides baseline corrosion resistance without adding dimensional thickness—a critical consideration for main cap fastening where precise tolerance control directly affects crankshaft bearing clearances and oil film strength. Installation requires proper torque sequencing and pattern as specified in engine rebuild documentation to ensure even clamping load distribution across the main bearing saddle.

This fastener is essential for engine builders, performance shops, and LS engine enthusiasts performing factory rebuild, refresh, or displacement upgrade work. Whether assembling a stock replacement LS engine for street duty or preparing a high-horsepower platform for track use, OEM-specification main bolts are non-negotiable for structural integrity and reliability. The windage tray stud integration ensures the tray assembly seats properly and functions as designed to minimize oil aeration and parasitic loss. Sold individually—verify your application requires the 6-bolt main configuration before ordering, as some LS variants use 4-bolt designs.