These adapter plates allow an LT4 Supercharger to be installed on LT1, L82, L83, L84, L86 , L87 Cylinder heads.

Lt4 Valley cover is required as well as extension pipe.

Corvette Accessories or Camaro Accessories are required when using these adapter plates.

Note for Trucks - 

Tall spacers are required  for 2014-2019 Truck Accessories - https://c-8parts.com/collections/ict-billet-products/products/l83-l86-lt-cylinder-heads-to-lt4-supercharger-adapter-plates

Lt4 Valley cover with PCV  may be used with 3" extension pipe when using 2014-2019 Truck Accessories.

Depending on your supercharger year make and model a custom  offset pulleys may also be required for proper belt alignment.