Rectangular adapter for any Cathedral Port heads of the LS1, LS3, LSA, ZL1, CTS-V, LSX series. Compatible with LS1, LSX and LS6 cylinder heads for versatility. These adapters will allow you to install an LS3 intake manifold or supercharger on any LS Cathedral Port cylinder heads.  Includes galvanized grade 8 Allen screws for factory compressor mounting and black, high quality Viton O-rings. Made of durable 6061-T6 aluminum and CNC machined.

The set includes:

• 2 adapter plates (1/2 inch thick) with 8 O-rings.