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- Compatible with thin-stem valves if thicker keepers that maintain correct valve stem-top collar engagement are used
- Late single bottom collars are included for use in S&S cylinder heads for shovels and stock late 1981-1985 heads
- Use with stock-style bottom collar, valve guides, valves with stock 3/8" stem, and stock keepers
- Includes 4 inner springs, 4 outer springs, and 4 aluminum top collars