Fits Factory Heads, machining not required.

Max Output II Valve Spring Kit for SB FORD GT40

Application: Hydraulic Roller, up to .550" Lift, 132 Lbs Seat Pressure

Fitment: GT40 302 heads (for GT40p 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 long awaited, latest version of our popular .550" 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 even better!

The new .550" kit features a redesigned spring with increased open loads to enhance RPM capabilities. This is the 3rd design, w/ it's higher open loads now qualifies to bear the "Max Output" title. We brought the open load up but not too much, just the right amount to make good high RPM power yet still work with stock iron roller lifters and 5/16" bolt down pedestal mount rockers.

For you flat tappet guys, don't fret and we have new max output versions for flat tappet cams available also. (check our other listings or write)

The new design handles a wider range of cams including many aggressive lobe profiles.

Max Output II .550" works with cams with up to around 248 degrees duration @ .050" Also works well with smaller cams with a lift range between .480"-.550" For applications with even lower lifts, check out our new Max Output .525" lift beehive spring kit. (Available in mid August 2020)

As with all our other drop in kits for Gt40, 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. (Installed height spec sheet included with every kit)

Suitable for 1.6 or 1.7 ratio rocker arms as long as the lift does not exceed .550" @ 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 designed by Alex and manufactured in the USA- an Alex's Parts exclusive which you won't find anywhere else.

      Specifications:

• 1.488" Outside Diameter
  
• Fits over factory stepped spring base w/o machine work
  
• Seat- 132 Lbs @ 1.755" Valve Closed Installed Height (tested w/ retainer step on damper) [see Note: 1 below]
  
• Open Load @ .500" Lift: 333 Lbs.
  
• Open Load @ .550" Lift: 357 Lbs.
  
• Rate- 400#
• Spring seat machining NOT needed
  
• Works best when used with lifts between .500"-.550"
  
• 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

     Fitment:

• 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- This kit normally requires a shim or two to obtain the target installed height. 

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 installed height specification. Only use the spec listed on the card included with your kit. Put the card in a safe location for future reference. Once the kit is built, installed height is matched to that particular kit- this information will not be available from us after the kit has shipped.

Note 2: This item is intended for hyd roller cams. For hyd flat tappet cams see our other listings.

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