For LS1 Cathedral Port Cylinder Head to LS3 LSA ZL1 CTS-V Supercharger Adapters. NICECNC intake adapters adopt 6061-T6 billet aluminum for great solidity. CNC machined with the proper port alignment. Hard anodized surface for elegant black finish, highly resistant to corrosion. These adapter plates will allow you to install an LS3 intake manifold or supercharger onto any LS cathedral port cylinder heads. Includes grade 8 zinc coated allen bolts for installing a factory supercharger and black viton high quality o-rings. These plates will clear the CTSV LSA and ZL1 alignment pin, no need to remove. Material: 6061 billet aluminum. 2 adapter plates (1/2 thick) with 8 sealing O-ring. Fit For…