Use with 11/32" Aftermarket Aluminum heads.

Universal V8 Dual Spring Kit, 140 Lbs Seat, .650" Lift, Hyd Roller

Spring base size requirements: 1.480" OD or bigger w/ a guide flange diameter between .558"-.562"

This dual spring kit is intended for use with aftermarket aluminum heads w/ a Hyd Roller.

Most aftermarket heads have a guide collar/flange diameter of .558" to .562" which the locators in this kit fit perfectly. Measure the guide flange/collar right where the guide contacts the spring base, not above where the seal fits.

Works with a wide range of cam profiles. Also works with many HP street cams and boost.

       Included Items:

• 16- Dual Valve Springs, 99893
  
• 16- Chrome Moly Steel Retainers, 7 Degree
  
• 16- 11/32" X 7 Degree Hardened Steel Locks (32 Pcs)
• 16- Chrome Moly Steel Locators, 1.475" OD, .795" Step, .568" Center Bore
  
• Installed Height Spec Card

      Spring Specifications:

• 1.460" Outside Diameter
  
• .800" Inside Diameter
• Seat Pressure: 140 Lbs @ 1.835" (valve closed)
  
• Spring Rate: 391#
  
• Average Coil Bind: 1.050"
  

     Open Pressures:

• 329 Lbs @ .500" Lift
• 339 Lbs @ .525" Lift
  
• 349 Lbs @ .550" Lift
  
• 360 Lbs @ .575" Lift
  
• 371 Lbs @ .600" Lift
  
• 382 Lbs @ .625" Lift
• 393 Lbs @ .650" Lift

To verify fitment on your heads, check the following specifications. (must be measured, most head manufacturers do not supply all these specifications)

1. Measure the guide boss diameter down next to the spring base. You'll want to have between .558"-.562" here.

2. Measure the OD of the spring base, it will need to be 1.480" or bigger.

3. Measure the valve tip length. This is the distance between the topside of the keeper/lock groove to the tip of the valve. Most valves will have a .250" tip length, this is what you want here.

4. Measure the valve stem protrusion. This the distance between, the bare spring base to the tip of the valve. (No shims, cups or locators for this measurement) This kit w/ Std locks will want right around 2.070". If it is 2.115" or more, you'll want to use a set of our .045" down locks. If it is 2.145" or more, you'll want to use a set of our -.075" locks. Remaining installed height decreases would be accomplished using shims.  If the stem protrusion measures less than 2.070", you'll need to use "Plus" locks to increase installed height. Keep in mind, the use of Plus locks will reduce retainer to rocker arm clearance.

Since all spring kits are tested and built after order, please allow 7-10 days for use to build and ship this item.

Thank you, Alex~