• Premium quality Titanium alloy valve spring collars
• Crane's new "Thermo-Cool" coated springs
• Have shown almost unbelievable results in both tests and actual racing applications
• The friction reducing quality of the coated spring is its ability to dispense heat quicker than an uncoated one
• This helps eliminate hot spots in the spring coil which cause weakness and ultimate pressure loss
• Cooler springs also means less oil burnoff helping reduce contamination and oil temperature
• 175# "Thermo-Cool"
• Fits Big Twin Evolution 1984/1999, Sporster Evolution 1986/2003 & Twin Cam 88" 1999/2004

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