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SB Ford, GT40 Drop In Valve Spring Kit, Hyd Roller .550" Lift, VSK7h48-13

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Calculated at checkout

Product Description

Fits Factory Heads, no machining required.

High Lift Valve Spring Kit for SB FORD GT40

Application: Hydraulic Roller, up to .550" Lift, 133 Lbs Seat Pressure

Fitment: GT40 302 heads (for GT40p kits, check our other ads)


GT40 heads require special attention when selecting valve springs for high lift, high performance Hyd Roller Cams.

Since these heads come with different tip length valves, retainers and springs from the factory, care must be taken when selecting valve springs, retainers and locks.

Unlike some of the earlier SB Fords where the tip lengths were the same for both intake and exhaust, GT40 heads use two different lengths.

Since the goal is to use the same high performance springs on all sixteen valves, special retainers and locks are required to make it possible.

Our drop in valve spring kit is specially engineered to fit GT40 heads. It comes with select retainers and locks designed to fit GT40 staggered tip lengths.

Fits GT40 heads without additional modifications.

Designed for mild to moderate high performance Hydraulic Roller cams, our kit will handle most cams up to around 232 degrees duration @ .050".

If you need help determining if these will work with your cam, just send us an e-mail with the cam specs or better yet, the cam brand & part number and a link to the specification page. We'd be happy to verify compatibility.

Works great with many of today's popular performance cams.

Suitable for 1.6 and 1.7 ratio rocker arms as long as the lift does not exceed .550".

Vsk7h48-13 works with a large number of hi performance street roller cams.

These are custom made springs exclusive to Alex's Parts.



      Spring Specifications:

  • 1.460" Outside Diameter
  • Fits over factory stepped spring base
  • 133 Lbs @ 1.740" Valve Closed Installed Height
  • 298 Lbs @ .500" Lift
  • 315 Lbs @ .550" Lift
  • Spring seat machining is NOT required
  • Works best when used with lifts between .490"-.550"



     Kit includes:

  • Eight Intake Retainers, labeled for easy identification
  • Eight Exhaust Retainer, labeled for easy identification
  • Hardened Valve Locks
  • 16 Drop in springs
  • Spec Sheet
  • Installed height Specifications



  • Staggered tip length SB Ford GT40 heads


Excellent valve control w/ High Performance cams up to 232 degrees duration @ .050".

Suggestions: Measure spring installed heights- This kit normally requires some shims to obtain the target installed height. 

Buyers can add: Shims and/or Seals by checking the boxes to the right of the pictures. These items are added in at slightly discounted prices with reduced shipping rates.

Please note our viton valve seals are premium OE style replacement seals which are far superior to gasket set seals.


Note: This item is intended for hyd roller cams. Hyd flat tappet cams normally use a lower seat pressure such as 110 Lbs.




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

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