Fits Factory Heads, Custom Built to Order w/ 30 day processing time.

Max Output Beehive Valve Spring Kit for SB FORD GT40, Turbo/Supercharged w/ Stock Cam

Application: Stock Cam w/ Boost, up to .475" Lift, 150 Lbs Seat Pressure

Fitment: GT40 302 heads (for GT40p kits, check our other listings)

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

Here's another Pacaloy Beehive spring kit from Alex's Parts. These are designed for boosted applications running the stock cam and will work right up to .475" lift. This means they'll work with the HO cam with 1.6 or 1.7 ratio rockers.

Now, on all our spring kits- when we say the lift is good to certain number, that means the springs are good right up to that advertised lift figure without concern of running too close to coil bind. At full lift, there is .060" or more spring travel range past our advertised lift. This means the spring still has .060" lift range before it reaches coil bind. We mention this because some folks have expressed worry about running springs close to advertised lift and we wanted to clear this up.

Use our recommended installed height and lift is good to .475"

Alright, now you guys and gals out there into bolting on a turbo or supercharger are in luck!

Boost makes HP, no doubt but these engines do require increased spring pressure, especially seat load/pressure. Increased seat is important because the boost is pushing on the intake valve and will blow it open and leak some of the intake charge into the cylinder at the wrong time. The typical negative result of this is not being able to reach peak RPM. Engines where the intake valves are opening from boost will run flat at a lower high RPM than expected.

This kit with it's 150 Lb seat load is designed to support boosted engines w/ lifts up to .475".

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We get allot of questions as to what makes beehive springs so desirable, folks want to know whats up with these unique shaped springs?

There are several benefits but lets focus on the obvious advantage: Reduced Reciprocating Weight! (RRW)

Anything which helps the spring open and close with less resistance will improve the "valve control factor". For the same reason many race engines use titanium retainers, using small beehive retainers and a lighter "top side" of the spring offers the potential to increase power.

Since the top of the spring is way smaller than the bottom, it uses a tiny retainer which is way lighter than a traditional spring retainer, the difference in weight alone improves the springs ability to control valve action throughout the RPM range.

If you have questions, fell free to reach out to us by using the contact us link.

      Specifications:

• Top OD: 1.055"
• Top ID: .652"
• Bottom OD: 1.405"
  
• Bottom ID: 1.005
• Fits over factory stepped spring base w/o machine work
  
• Seat Load- 150 Lbs @ 1.710"- Valve Closed Installed Height [See Note: 1 below]
  
• Open Load @ .444" Lift: 320 Lbs.
  
• Open Load @ .475" Lift: 334 Lbs.
  
• Rate- 403#
• Spring seat machining is NOT required
  
• Springs are good to .475" w/ an additional .060" travel range beyond .475" lift (solid height safety margin)
  
• Parts are labeled for Intake and Exhaust positions
  

     Kit includes:

• Sixteen Chrome Moly Steel Beehive Retainers
  
• Hardened Valve Locks
• 16 Drop in Beehive Springs
• Spring Spec Sheet
• Installed Height Target Spec

     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 to make sure every position is correct. An installed height mic for beehive retainers is required.

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 21-30 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 specific installed height. Use only the target height listed on the spec 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 it has shipped.

Note 2: This item is intended for hyd roller cams. Not suited for Hyd flat tappet cams.

Note 3: The installed height tolerance for this spring is: -.010"/+.010". Set up installed heights as close as you can. Be sure the cone area of the retainer is clean and keep dust/debris away from locks/keepers. Dirty parts will affect installed heights by more than one might expect.

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