these are the "upgraded" dual valve springs with a damper, retainers, and locks that come on the TFS-51400004 twisted wedge heads
in great shape, around 25k miles
springs
Trick Flow Specialties TFS-31400414 - Trick Flow® Valve Springs - Overview - SummitRacing.com
retainers
Trick Flow Specialties TFS-21400424 - Trick Flow® Steel Valve Spring Retainers - Overview - SummitRacing.com
locks
Trick Flow Specialties TFS-52400444 - Trick Flow® Valve Locks - Overview - SummitRacing.com
summit total cost new $188..
asking $100 shipped
in great shape, around 25k miles
springs
Trick Flow Specialties TFS-31400414 - Trick Flow® Valve Springs - Overview - SummitRacing.com
retainers
Trick Flow Specialties TFS-21400424 - Trick Flow® Steel Valve Spring Retainers - Overview - SummitRacing.com
locks
Trick Flow Specialties TFS-52400444 - Trick Flow® Valve Locks - Overview - SummitRacing.com
summit total cost new $188..
asking $100 shipped