KRE D Port Spring Upgrade – Solid Roller H11 Tool Steel

Description

This is a H11 Tool Steel SOLID ROLLER spring upgrade for the KRE D port heads.  If you are running a solid roller cam and you want to run H11 tool steel springs, you will need to provide us with your cams specs AND select this spring upgrade.  Standard KRE D port heads come setup with hydraulic flat tappet cam springs.  This upgrade also comes with Ferrea 6000 series valves.