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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, High Lift 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 which incudes GT40P and E7 heads.

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.

They normally have .393" tip length intakes and .481" tip length exhausts.

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 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 Motorsport, Trick flow, Comp & Lunati performance cams.

Suitable for 1.6 and 1.7 ratio rocker arms as long as the lift does not exceed .580"


      Spring Specifications:

  • Spring Type- HP Single w/ Damper
  • Machine work required?- NO
  • 1.460" Outside Diameter
  • I.D.- Fits over stock 1.00" register step
  • 120 Lbs @ 1.775" Valve Closed Installed Height (installed height measurements required)
  • 280 Lbs @ .500" Lift
  • 310 Lbs @ .580" Lift
  • No spring seat machining required



     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 (as shown in picture above)




  • GT40P heads normally have .393"/.481" tip length valves
  • This kit comes w/ parts to fit .393" & .481" tip length valves using Hyd Roller.
  • Optional seat pressures include 110 for flat tappet cams & mild hyd roller cams


 Our GT40P spring kit is the finest drop in Gt40 spring kit available.

Excellent valve control w/ High Performance cams up to 234 degrees duration @ .050".

Applications with larger cams should one of consider our Max Output or our limited edition spring kit.

For specifications on Max Output spring kits, check our other spring kit listings.

Requirements- Measure valve spring height during installation. For more information on setting up valve spring installed height, read the information we has available under the "Valve Spring Shims" category.

Buyer can add: Shims, Seals or upgrade to .600" lift springs by checking the boxes to the right of the pictures. These items are added in at slightly discounted prices with reduced shipping rates. Although we also offer std shims, we recommend using hardened shims with this kit.



*Note1: To upgrade to .600" springs, simply use the check box towards the top of this page. Changing from .580" lift springs to .600" spring adds $20.00 to the price.

Note2: Customers running a up to .480" lift including a stock cam with 1.6 or 1.7 ratio rockers should check out the new addition to our GT40P valve spring kit family. Enter VSK7A49 for GT40 and VSK7A48 for GT40 into search to view details.


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

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