Trick Flow Valve Spring Upgrade Kit for Ford 289-351W Factory Cast Iron Cylinder Heads, Steel Retainers, 358lbs Spring

Specs:
Valve Spring Style: Standard
Number of Springs Per Valve: Single
Maximum Valve Lift (in.): 0.540 in.
Retainers Included: Yes
Retainer Material: Steel
Outside Diameter of Outer Spring (in.): 1.470 in.
Damper Spring Included: Yes
Spring Rate (lbs/in.): 358 lbs./in.
Inside Diameter of Outer Spring (in.): 1.075 in.
Inside Diameter of Inner Spring (in.): 0.803 in.
Locks Included: Yes
Lock Material: Steel
Lock Groove Quantity: 1-groove
Lock Style: 7 degree
Valve Stem Seals Included: Yes
Valve Springs Coated: No
Valve Stem Diameter (in.): 0.341 in.
Valve Stem Diameter (mm): 8.66mm
Remanufactured: No
Quantity: Sold as a kit.
Notes: Designed to upgrade factory Ford 289-351W cast iron cylinder heads. Kit also includes valve spring shims. Will work with hydraulic roller camshafts up to 0.540 in. lift.