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  • 1.640 O.D. Solid Roller Valve Spring
  • Manley Nextek #221425-16
  • 320 lbs. on seat
  • .840” max lift
  • Max RPM 8200-8400
  • Titanium Retainer: 8507
  • BBC Valve Lock: 9005
  • BBF Valve Lock: 9010