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FTI LSx Dual Valve Spring Kit GEN6D-K1

  • Kit Contents
  • Image 2
  • Valve Locks
  • Valve Seals
  • Locators
Your Price:
$399.99 (You save $30.00)
8.00 LBS
Calculated at checkout

Product Description

FTI GEN6D PAC Racing Dual Valve Spring Kit (Steel Retainers)

The proper valve springs are one of the most important pieces of a performance engine. Serious street machines, hardcore racers and engine builders of performance cylinder heads with forced induction, now have a brand new, extreme usage valve spring, spring retainer, valve lock and seal kit that safely extends engine RPM and boosts performance capability.

This custom built PAC Racing 1206X based valvetrain kit features precision wound, heat-set, small diameter, dual valve springs with the required seat and open load pressure plus total spring travel to accommodate cams with aggressive camshaft lobes with gross valve lifts of up to .700” depending on the installed height. The valve springs contained in each kit are carefully tension matched and all supplied components come complete and ready to install.

Included are CNC machined, chromemoly alloy spring retainers, CAD designed to deliver maximum strength and durability. The hardened and machined spring locators used, were designed to accurately locate the inner spring, preventing abrasion and scuffing when using aluminum cylinder heads. Precision machined & hardened 4140 steel alloy 7-degree valve locks are also provided for superior valve stem holding reliability. Premium quality, Viton® steel reinforced valve stem seals are included for correct valve stem lubrication and oil control.

The PAC Racing 1206X is an extreme duty valve spring designed for lightweight LSx style valvetrain used in a high RPM or forced induction engine. Will fit most aftermarket cylinder heads with small 1.280" diameter dual spring packages. PAC Racing's proprietary Pacalloy material and round wire construction are used.


1) Choose your valve stem diameter: 11/32" or 8mm

2) Choose your valve seal diameter: .500" or .531" guide top

3) Choose your valve guide diameter: .500" or .563" guide base

The standard spring kit contains lightweight chromemoly retainers but you can upgrade to the optional titanium or tool steel retainers. Certain aftermarket cylinder heads may require a custom built version of this kit. Email for more information on custom cylinder head applications.


  • 1.290" Outside Diameter
  • .950" Inside Diameter
  • .680" Inside Diameter
  • Maximum lift: .700"
  • Seat load:145# at 1.800"
  • Open load:411# at 1.100"
  • Rate: 409 lb/inch
  • Coil bind: 1.000"




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Product Reviews

  1. pac 1222x 5 Star Review

    Posted by on 21st Aug 2016

    Way better spring than the supposedly upgraded springs on my AFR 205s. No more valve float and no more spring breakage. Pricey but you get what you pay for.

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