Ferrea 5000 Series Hi Performance Exhaust Valve - SB Chevy - 1.600", 11/32" Stem Diameter, 4.910" Overall Length - (Set of 8) Head & Neck Restraint Systems it secures tightly without pre-wetting

it secures tightly without pre-wetting and is able to withstand direct heat up to 1800F and intermittent heat up to 2500F

They increase the manifold plenum area and provide the maximum thermo barrier between the manifold and carburetor

625 in Guide OD

and any other engine w/ 1/2" fuel rails w/ SAE style fuel tube

Ferrea 5000 Series Hi Performance Exhaust Valve - SB Chevy - 1.600", 11/32" Stem Diameter, 4.910" Overall Length - (Set of 8) Head & Neck Restraint Systems it secures tightly without pre-wettingThe 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