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SB Ford, GT40 Drop In Valve Springs Kit, Hyd Roller .580" Lift

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Product Description

 Fits Factory Heads, no machining required.

High Lift Valve Spring Kit for SB FORD GT40

Application: Hydraulic Roller, up to .580" Lift

Fitment: GT40 302 heads (we also offer kits for GT40P 302 heads, check our other ads)


Late model 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.

They normally have .393" tip length intakes and .495" tip length exhausts.

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 two different sets of retainers, eight intake retainers and eight exhaust retainers.

The performance springs in this kit fit 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 .580".




      Spring Specifications:

  • 1.460" Outside Diameter
  • .980" Inside Diameter
  • 120 Lbs @ 1.775" Valve Closed Installed Height (measurements required)
  • 280 Lbs @ .500" Lift
  • 310 Lbs @ .580" Lift
  • No spring seat machining required




     Kit includes:

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


 PARTS UPDATE- NEW ITEM Just in- Oversize length GT40P, GT40 & E7 Pushrods w/ 6.315" length. Enter 6.315" into search engine for details! (not included w/ spring kit)



  • GT40 heads normally have .393/.495" tip length valves
  • This kit comes w/ parts to fit .393" & .495" tip length valves using Hyd Roller.


 Our GT40 kit is the finest drop in spring kits available anywhere.

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

Applications with larger cams should consider our Max Output or our Max Output PLUS drop in valve spring kits. Also available under the valve spring category. Max Output Plus will be available in April 2014

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

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" springs by checking the boxes on 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.

Not to be confused w/ early 351w GT40 engines. Early 351W GT40 heads normally use .393" tip length valves on both. We also carry kits for 351W GT40. Kits for SBF w/ .393" valve will suit GT40 351W.



*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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