Crower 68921-1 Features:

Crower spring seat cup for LS1 spring applications Sold individually as a 1-piece replacement, Part Number 68921-1 Helps keep valve springs centered to reduce spring wandering Can help eliminate seat cutting in some builds and shimming in others

Spring Seat Cups For LS1 Individual Piece, Precision-fit, Aluminum-head Features:

• LS1 spring seat cup, sold individually, precision-engineered spring locator, aluminum head galling protection
• Helps prevent valve spring wandering in high-performance valvetrain applications, stable spring positioning
• May reduce need for seat cutting in some applications, may reduce shimming in others for easier setup
• Direct fit for Crower 68921-1 LS1 spring use, single-piece service replacement for targeted repairs and maintenance
• Performance valvetrain support for LS1 builds, protective seat interface for aluminum cylinder head durability