Precision Engineering for Peak LS Engine Performance Engineered to exceed rigorous OE standards, the BS 40640 Crankshaft Seal Kit delivers critical protection for your powerplant. This comprehensive set features a multi-layer rear main cover gasket constructed from thermally stable graphite composite and tear-resistant nitrile rubber bonded to a rigid steel carrier. This advanced material science combats compression loss, oil seepage, and thermal degradation—even under sustained high-RPM operation or towing loads. Unlike generic alternatives, our gasket maintains exact factory thickness (0.040") and bolt-hole alignment for zero-clearance installation on LS-series engines. Vehicle Fitment You Can Trust Designed for seamless compatibility with 8-cylinder engines (4.8L–7.0L) spanning two decades, this kit is the definitive solution for select model cars. Installation-Ready Design The gasket's laser-cut sealing edges and molded rubber corners ensure uniform clamp load distribution around the crankshaft opening, eliminating common failure points at curvature transitions. Anti-weep channels redirect oil flow while resisting blowout under high crankcase pressure. Included professional-grade tools—a stiff-bristle parts brush and industrial nitrile gloves—streamline surface prep and handling. Why Choose This Kit? Durability: Outperforms fiber/composite gaskets with 300% higher tear strength Thermal Stability: Withstands -40°F to +500°F without hardening or shrinking Value-Added: Gloves/brush save $15+ vs. buying separately Verified Fit: CNC-tooled using factory blueprints