Closed Deck V4, New Case Halves (Outright) EJ spring Kits The billet material that reinforces

The billet material that reinforces the combustion area has been further optimized with our V3 closed deck making it a far superior product to any sleeved block

The disc is generally smaller and thinner than the OEM disc making for lower inertia and therefore quicker

2011 Subaru Impreza WRX 2

With enhanced tri-metal copper lead construction with nickel barrier and SecureBond adhesion

This kit includes the following:

Closed Deck V4, New Case Halves (Outright) EJ spring Kits The billet material that reinforcesThis closed deck block design has been proven to withstand extreme boost levels resulting in high cylinder pressures without the worry of cracking a sleeve. The billet material that reinforces the combustion area has been further optimized with our V4 closed deck making it a far superior product to any sleeved block. With a closed deck block the stock sleeves are still in place eliminating all risk of dropping sleeves and pushing coolant that you have