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Dual Valve Spring Kit, 351C, BBF, SBF, SBC, 11/32" Universal, Includes: Springs, Retainers & Locks

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Product Description


High Lift Dual Valve Spring Kit

 Fitment: 351C- *(see note), BB Ford, SB Ford, SB Chevy, Olds & BBC w/ 11/32"


This dual spring kit is a great choice for many applications in need of dual springs.

Suited for several different cam types, they can be set up to work with: hyd flat tappet, mechanical flat tappet and many hyd roller cams. (not solid roller)

The springs can be installed to produce either 110Lbs, 120Lbs or 135Lbs to suit your cam of choice.


     An example of what type of cams  work with the various seat pressures.

  • Hyd Flat Tappet, High Performance Street- 110 Lbs Seat Pressure. 
  • Hyd Flat Tappet, High Performance Marine and Hot Street- 120 Lbs Seat Pressure 
  • Hyd Roller, Mild Performance Street- 120 Lbs Seat Pressure 
  • Hyd Roller, Mechanical Flat Tappet- 135 Lbs Seat Pressure 
  • These are considered general "rule of thumb" pressures, refer to your cam specs for cam manufacturer suggested loads.


As with any dual spring assembly, spring seat machining is required except for BBC & select heads with a large spring base, the rest will require spring seat machining.


If you would like us to verify suitability for your application, please send us a message through the "contact us" link. Please include a link to your cam specs or the brand and part number for us to look it up with.

We'll need to see duration @ .050", lift and lifter type; Hyd, Hyd Roll, Mech FT and the type of usage- Street, Oval track, Drag, etc.


      Spring Specifications:

  • 1.470" Outside Diameter
  • .805" Inside Diameter
  • Coil Bind: 1.050"
  • Rate: 391#
  • 110 Lbs @ 1.890"
  • 120 Lbs @ 1.865"
  • 135 Lbs @ 1.825"
  • Part Number: 99893-16


     Open Pressures:

  • 308@ 1.365"
  • 330@ 1.315"
  • 350@ 1.265"
  • 370@ 1.215"
  • 395@ 1.165"


     Kit Includes:

  • Sixteen Dual Springs
  • Sixteen Chrome Moly Steel Retainers, 7 degree 11/32"
  • Full Set of Hardened 7 degree Locks, 11/32" (Single Groove)
  • Specification Sheet
  • Installed Height Diagram 
  • Not for Mechanical Roller.

Excellent valve control for many High Performance cams with between 228-250 degrees duration @ .050".


*NOTE- On 351 Cleveland engines, valves must have single grooves and not the multi groove.


Alex's Parts- The smart choice in valve train parts~

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