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"NEW* SB Ford, GT40, Drop In Valve Spring Kit, Max Output II .530" Lift, Hyd Roller, VSK7F48-M2

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Product Description

Fits Factory Heads, machining not required.

Max Output II Valve Spring Kit for SB FORD GT40

Application: Hydraulic Roller, up to .530" Lift, 130 Lbs Seat Pressure

Fitment: GT40 302 heads (for GT40P & E7 kits, check our other listings)

Processing Time: Current processing time is around 30 days. This means your order will ship around 30 days after being placed.


Here is the latest version of our .530" lift spring kit.

Every time we order a large batch of springs, we use our acquired knowledge to improve the design to make the product better!

The new .530" kit features high output springs intended for mid lift cams including Comp XE profiles, Ford Racing letter cams as well as Anderson N-21 & N-41 cams with aggressive lobe profiles. 

Max Output II .530" works well with cams with up to around 242 degrees duration @ .050" with a lift range between .460"-.530"

As with all our other drop in kits for Gt40P, machining is not needed for proper installation. We do recommend the installed heights are measured and shimmed as required to obtain the target installed height.

Suitable for 1.6 or 1.7 ratio rocker arms as long as the lift does not exceed .530" @ the valve.

If you need help determining if these will work with your cam, use the "message us" link and include the cam brand and part number, we'll get back to you with an answer.

Max Output II Pacaloy springs are manufactured in the USA.




  • 1.477" Outside Diameter
  • Fits over factory stepped spring base w/o machine work
  • Seat- 130 Lbs @ 1.735" Valve Closed Installed Height (tested w/ retainer on) [see Note: 1 below]
  • Open Load @ .500" Lift: 340 Lbs.
  • Open Load @ .530" Lift: 360 Lbs.
  • Rate- 420#
  • Spring seat machining NOT needed
  • Works best when used with lifts between .460"-.530"
  • Parts are labeled for Intake and Exhaust



     Kit includes:

  • Sixteen Retainers
  • Hardened Valve Locks
  • 16 Drop in Pacaloy springs
  • Spring Spec Sheet
  • Installed height Specifications



  • Staggered tip length SB Ford GT40 heads
  • Heads w/ aftermarket .393"/.393" valves including Ford racing .383"/.383" tip length valves should click the .393"/.393" option check box.


Suggestions: Measure spring installed heights- Proper installed height set up might require shims to be added under the springs. 

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

Please note our viton valve seals use the OEM design but are manufactured from premium high temp Viton material. They're easy to install and are far superior to gasket set seals. If you want the best, these would be them.

Average shipment time is 30 days after order. We custom build these kits after order, they are not sitting on the shelf so be sure to place your order 30 days in advance. Don't hassle us about the wait as we do the best we can every day. Much appreciated!


Note 1: Each kit has it's own specified installed height. Use only the spec listed on the card included with your kit. Put the card in a safe location for future reference.

Note 2: This kit is intended for hyd roller cams, not intended for hyd flat tappet cams.




Alex's Parts- An American mom and pop shop~

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