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SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat, VSK7Jb48-P

  • For .393"/.393" tip length valves, use the appropriate check box option towards the top of the page.
  • Vsk7m49-M, 140 Lbs Seat, .575" Lift Drop in Spring Kit
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Product Description


Drop In Valve Spring Kit, SB FORD GT40

Application: Hydraulic Roller, up to .575" Lift w/ 140 Lbs Seat Pressure.

Works well for big cams as well as smaller cams w/ turbo and/or supercharger.

Current processing time is 4 weeks. This means the kit will ship in around 30 days after your order has been placed.



  • This kit comes w/ parts to fit OEM .393" & .481" tip length valves.
  • Can be customized for .393"/.393" tip length valves. Select this option when using .383"-.393" tip length valves.


New from our Max Output II series of drop in style spring kits.

This kit works with cams w/ up to .575" lift and up to around 248 degrees duration @ .050" (not to be confused with advertised duration which is always a higher number, use the duration @ .050" figure)

For those who love the cackle of a thumping cam, we've got you covered!

A good choice for boosted applications.




      Average Spring Specifications:

  • 1.487" Outside Diameter
  • Fits over stock SB Ford .995" Stepped Spring Base
  • 140 Lbs @ 1.735" Installed Height (see note * below)
  • 341 Lbs @ .500" Lift
  • 362 Lbs @ .550" Lift
  • 372 Lbs @ .575" Lift
  • Max Lift- .575" (Best when used w/ lifts between .510"-.575")
  • Average Coil Bind @ 1.100"
  • Spring seat machining not required
  • This kit requires shims to obtain 1.735" installed height. If you don't already have them, order a shim pack by using one of the options listed above.


     Kit includes:

  • Eight Intake Retainers and locks, labeled for easy identification
  • Eight Exhaust Retainers and locks, labeled for easy identification
  • 16 Drop in springs
  • Specification Sheet
  • Installed Height Specification




  • GT40P heads normally have .393/.481" tip length valves
  • To customize this kit for .393"/.393" tip length valves, use the appropriate check box at the top of the page. Select the .393"/.393" option when using our 1.545" GT40 stainless steel exhaust valves.


Recommendations- Measure valve spring installed height during installation and shim as required.

Note * Each kit comes with it's own target installed height specification card. For the best results, use the installed height specification included with your kit.

Please allow extra time for us to build your kit. Since these kits are all specially tested and assembled, additional time is required. Average shipping time is around 30 days after order date.





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