LS Valve Cover Mounting Bolts 8pcs.

LS Valve Cover Mounting Bolts 8-piece fastener set (Part #66330) delivers OEM-grade hardware for engine block assembly and maintenance. These valve cover studs and hex nuts are engineered for secure, repeatable torque retention on LS platform engines, where proper fastener specification directly impacts gasket seal integrity and prevents coolant or oil leakage. The set includes eight complete stud-and-nut assemblies sized to factory specifications, making this an essential consumable for any LS engine rebuild, gasket replacement, or valve cover service procedure.

Each fastener features a 6mm x 1.00 metric thread pitch with 1.387-inch stud length, paired with 4-1/8 inch tall hex head nuts. The steel construction with black oxide finish provides corrosion resistance in engine bay environments and maintains a professional appearance under the hood. Black oxide coating resists surface rust and minor oxidation common in high-heat compartments, ensuring fasteners remain serviceable across multiple gasket service intervals. The hex nut geometry allows standard socket application for controlled installation torque without risk of fastener damage or cross-threading on the valve cover mounting bosses.

Technicians and engine builders rely on OEM-spec fastener sets to eliminate variables during reassembly—using mismatched or undersized hardware risks gasket failure, oil weeping, and repeated teardown cycles. The eight-piece count covers both sides of a standard LS valve cover assembly with spares for stripped threads or lost fasteners during service. Whether handling street engine maintenance, performance builds, or marine and powersports applications using LS powerplants, this fastener set ensures proper clamp load and sealing surface pressure on every install.