VTT Billet Wheel Spacers

VTT B58/S58 Head Port Block-Off / Built Check Valve Kit

The VTT B58/S58 Head Port Block-Off / Check Valve Kit is designed to either seal off or convert the factory head ports used by the OEM low-side PCV system. These ports in the cylinder head utilize engine vacuum to evacuate crankcase gases — but in the process, can allow oil to enter the intake manifold, leading to valve carbon buildup and other performance issues over time.

This kit provides two configuration options:

• Block-Off Version – Completely seals the factory head ports to prevent oil intrusion and unwanted vacuum leaks.

• Billet Check Valve Version – Converts the head ports into a robust internal PCV system using precision-engineered check valves. These one-way valves allow vacuum to function as intended while blocking boost pressure from entering the crankcase or charge tract.

By bypassing the factory PCV valve in the valve cover, the VTT kit replaces it with an improved three-valve internal system integrated directly into the cylinder head. This design improves reliability, simplifies plumbing, and ensures consistent crankcase pressure management — critical for both stock and high-performance B58/S58 applications. This kit does NOT require any tapping, meaning no metal to get into the engine etc. You simply tap the plugs or check valves into place.

Key Features

• Eliminates oil draw-through into the intake manifold

• Prevents carbon buildup on intake valves

• Converts to an internal, head-integrated PCV system

• Utilizes precision-machined check valves for boost sealing

• Fully reversible — Block-offs or valves can be removed if needed

• No tapping is required. Easy install, by tapping the blocks or valve into place.