MPC Hundred Proof Valve Cover HardwarePRODUCT INFO Hundred Proof Valve Cover Hardware Kits are designed to replace the old, brittle OEM bolts and cracked rubber seals on your valve cover, and look great while doing it. This kit is a complete replacement and features 2 separate seals better than any kit on the market. Go ahead and upgrade your valve cover hardware with our Hundred Proof Valve Cover Kit. Youll save yourself the head ache of trying to get those broken OEM bolts out later!