LS1 Cathedral Port Cylinder Head to LS3 LSA ZL1 CTS-V Rectangle Billet Intake Manifold Adapter Plates (Silver). Size: Silver Brand: Endxedo MPN: EM-1021-AL UPC: Does not apply EAN: Does not apply. Model:? LS1 Cathedral Port Cylinder Head. Item Weight:? 3.83 pounds. Package Dimensions:? 17.36 x 9.13 x 1.46 inches. Country of Origin:? China. Item model number:? EM-1021-AL. Date First Available: September 27, 2022. Application: Compatible with ANY Cathedral Port Heads and will adapt to ANY rectangle port intakes, supercharger or blower. Will not fit raised port LS7 intakes. Easy Installtion: High quality transmission adapter fitting, includes other necessary hardware. Premium Aluminum, Intake manifold bolt lengths required when used with Car intake manifold (M6 x 130mm) Truck, intake manifold (M6 x 90mm). High Pressure Resistance: Port cylinder head to ls1 cathedral intake adapters from 6061-T6 aircraft billet, corrosion resistance and high strength to withstand up to 3 times normal operating pressure. Package Include: 8 x bolt, 8 x nut, 8 x O-ring, 2 x adapter plates.