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FTI Solid Roller Dual Valve Spring Kit GEN8C-Kit

FlowTech Induction

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FTI GEN8C Solid Roller Spring Kit - (Steel Retainers)

The proper valve springs are one of the most important pieces of a performance engine. Serious street/strip machines, hardcore racers and engine builders of performance cylinder heads with solid roller camshafts, now have a brand new, extreme usage dual valve spring, light-weight chromemoly retainer, machined valve lock and viton seal kit that safely extends engine RPM and boosts performance capability.

This custom built PAC Racing 1237X 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 solid roller camshafts with aggressive 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 valve spring retainers, 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 and hardened steel alloy seven degree valve locks are also provided for superior valve stem holding reliability. Premium quality, steel reinforced Viton valve stem seals are included for correct valve stem lubrication and oil control.

The PAC Racing 1237X is an extreme duty valve spring designed for lightweight LS style valvetrain used in a high RPM or forced induction solid roller 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: 5/16" - 11/32" - 8mm

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

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

Certain aftermarket cylinder heads may require a custom built version of this kit. Email for more information on custom cylinder head applications.


  • 1.274" Outside Diameter
  • .630" Inside Diameter
  • Maximum  lift: .700"
  • Seat load: 200# at 1.800"
  • Open load: 585# at 1.050"
  • Rate: 550 lb/in
  • Coil bind: 1.045"