Ferrea 5000 Series Exhaust Valve - SB Chevy - 1.500", 11/32" Stem Diameter, 4.935" Overall Length Helmet Forced Air Rocker Switch There are four small ventilation

There are four small ventilation holes molded into the top of every ST5 helmet

which allows the spark to naturally seek the path of least resistance

High burst pressure

Friction Lock Adjuster

Ultra-Lite Scalloped

Ferrea 5000 Series Exhaust Valve - SB Chevy - 1.500", 11/32" Stem Diameter, 4.935" Overall Length Helmet Forced Air Rocker Switch There are four small ventilationThe 5000 Series Valves have become the alternative for performance engine builders that use competitors "street" or "performance valve". These valves are produced in Ferrea's CNC centers allowing tight tolerances and cost effective design. They feature a one piece forging made from stainless steel, a special heat treatment process, hard chrome stems, and hard tip. Most applications are available in an undercut stem and dished head, while other