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SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller .580" Lift

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Product Description

Fits Factory Heads, no machining required.

High Performance Valve Spring Kit for SB FORD GT40P

Application: Hydraulic Roller, up to .580" Lift

Fitment: GT40P, E7 and other 302 heads w/ .393"/.481" tip length valves


Our High Performance valve spring kits are specially engineered to suit SBF heads with staggered tip length valves, including GT40P and E7 heads.

We carry them in several different configurations: .480", .540", .580" and .600" lifts. Each kit offers it's own advantage to work with a wide range of different camshaft profiles.

This listing is for the .580" version, VSK7k49

Unlike some of the earlier SB Fords where the valve tip lengths were the same for both intake and exhaust, GT40P heads use two different lengths.

Since the goal is to use the same high performance springs on all sixteen valves, a special retainer and lock combination is are required.

Our drop in valve spring kit is engineered to fit these heads with outstanding results.

The kit comes with locks which are marked for Intake and Exhaust.

Our performance springs fit GT40P heads without additional modifications, no machine work required. Just set up the installed heights and assemble.

Designed for mild to hot street high lift Hydraulic Roller cams, it will support many high lift cams up to around 228 degrees duration @ .050"

This kit works well for street cams with high ratio rockers arms with increased lift.

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.


      Average Spring Specifications:

  • Spring Type- HP Single w/ Damper
  • Machine work required?- NO
  • 1.460" Outside Diameter
  • I.D.- Fits over stock .990"-.997" Register / Step
  • 124 Lbs @ 1.765" Valve Closed Installed Height
  • 284 Lbs @ .500" Lift
  • 312 Lbs @ .580" Lift
  • Works best when used with cams over .520" lift (for lifts under .520", see our .550" lift kits.)



     Kit includes:

  • Package of eight intake retainers & locks.
  • Package of eight exhaust retainers & locks
  • 16 Drop in High Performance valve springs
  • Specification Sheet
  • Installed height diagram




  • Staggered tip length SB Ford GT40p heads


Requirements- For best performance, measure valve spring height during installation and add shims as required to establish the target installed height. (specification included with every spring kit)


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.


Note: This item is currently not available for Flat Tappet cams. Order for hyd roller only




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

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