This is the 125lb high load track heat spring upgrade kit for OE PI and TFS TW FMOD heads. Excellent spring for high rpm, supercharged, and turbo applications. On the spintron, these springs pull past 8k with the OE follower and lash adjuster. The springs are a beehive type design and have a nano peen finishing process which increases their longevity.
The kit includes locks, retainers, tall seals (OE PI 2V), Short seals (TFS TW), shims. 125lb when installed at 1.600, 0.580 max lift recommended.
The kit includes locks, retainers, tall seals (OE PI 2V), Short seals (TFS TW), shims. 125lb when installed at 1.600, 0.580 max lift recommended.