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SB Ford, GT40P Drop In Valve Springs Kit, Hyd Roller .560" Lift, VSK7i49-R5

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Product Description

Fits Factory Heads, no machining required.

.560" Lift Valve Spring Kit for SB FORD GT40P, #R5

Application: Hydraulic Roller, up to .560" Lift.

Fitment: GT40P 302 heads

This is a new version of our popular .560" spring kit # Vsk7i49 which had 120 Lbs seat. The new version has a little more seat pressure coming in around 127 Lbs and yes, it still accepts up to .560" lift. It also has a tad more open pressure which is always a good thing for hyd roller cams. This new kit uses the same part number as the previous kit with the exception that it has R5 added to the number. Old version- Vsk7i49, New version- Vsk7i49-R5

An added feature is we've updated the retainers and locks so the installed height sets up closer to the recommended target height when used with heads which have never been apart and still have the stock valves with staggered tip lengths. Some heads will not need any shims at all. Naturally, it's best to measure the installed heights to verify they're where they should be but the installed heights on the new R5 kit come in closer than the previous .560" kit. (heads which have been apart or had a valve job will most likely need some shims)

We have also added the option to purchase just a set of .015" hardened shims alone as well as continue to offer our hardened shim pack that comes with .030" and .015" shims for heads going to the machine shop for a valve job.

With it's increased output, R5 works with a wide range of cams and is still priced in the lower range making it a good choice for builders on a budget.

R5 works for many cam options- can be used with Ford's "B" & "E" cams with 1.7 ratio rockers as well as the stock HO cam with high ratio rockers and of course, lots of other profiles in the 214-226 duration @ .050" range.

We've also added the option to order the kit for use with .393"/.393" tip length valves which is good for those who have purchased aftermarket exhaust valves with a .393" tip length. Since the stock intake tip length is .393", if you're changing the exhaust valves to aftermarket with .393" tip lengths, you'll want to use the .393"/.393" tip length option located towards the top of this page.

If you need help determining if the .560" R5 kit will work with your cam, just message us with the cam specs or better yet, the cam brand & part number, we'll be happy to verify compatibility. Be sure to let us know if you're going to run the stock 1.6 ratio or 1.7/1.72 high ratio rockers.


       Spring Specifications:

  • 1.460" Outside Diameter
  • Fits over factory stepped spring base
  • 127 Lbs @ 1.765" Valve Closed Installed Height
  • 283 Lbs @ .500" Lift
  • 303 Lbs @ .560" Lift
  • Spring seat machining is NOT required


      Kit includes:

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


Buyers can add: Various shims, viton valve seals or order the kit to work with heads which have aftermarket exhaust valves with .393" tip lengths. Simply use the optional check boxes towards the top of this page.


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