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Valve Spring Kit, 4.3 V6 Chevrolet Vortec, HI-Perf Hyd Roller, 120 Lbs Seat

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Product Description

 Drop in fit, .550" Lift, 4.3 V6 VORTEC engines

Valve Spring Kit for Chevy 4.3 V6 Vortec, 120 Lbs Seat

 High Performance Hydraulic Roller, up to .550" Lift

This valve spring kit is engineered to fit 4.3 iron Vortec heads w/ hyd roller. Intended for use w/ duration @ .050" figures between 200-224 degrees on the intake. (not to be confused w/ advertised duration, exhaust duration can be higher)

We engineered this kit with all the right parts so Vortec heads can be build without the need to machine the guide for increased lift.

Its common knowledge Vortec heads have a problem w/ retainer to seal clearance. The stock retainers and springs do not allow for more then around .460" lift.

This kit is specially engineered to allow for increased lifts, up to around .550".

Our vortec kits solve two common problems on these heads.


  • The retainer to seal clearance issue.
  • and
  • Spring base diameter issue (vortec heads will not accept common SBC springs)


The clearance issue between the retainer and seal was solved by manufacturing the retainers to offer maximum clearance between it's bottom side and the top of the seal. The bottom of the retainer is machined so the bottom edge of the retainer is close to the bottom side of the locks. This is what gives the added clearance between retainer and seal without the need to machine the guides down.

Our vortec springs are a perfect fit on the stock Vortec spring base.

Both problems solved and no machining required!

These kits were engineered over twelve years ago and have been in use world wide with excellent results. A true and proven design with a long history of performance and durability.



         Kit comes with enough parts to suit 4.3 V6 vortec engine:

  • Twelve- High Output Drop In Fit Valve Springs
  • Twelve- Chrome Moly Retainers, 7 degree
  • Twelve- 7 Degree Hardened Valve Locks (24 pieces)

Proper installation requires measuring the installed heights and shimming as required.  (installed height specifications are included with kit)


  • Outside Diameter- 1.270"
  • Inside Diameter- .880"
  • 120 Lbs @ 1.765" - Great for Performance Hydraulic Roller Cams or Mechanical Flat Tappet Cams
  • 309 @ .500" Lift
  • 327 @ .550" lift
  • Rate- 378
  • Average Coil Bind- 1.145
  • Spring Type- Straight wall from bottom to top


Suitable for many Hyd Roller cams w/ up to around 226 degrees duration @ .050" on the intake.

Works with OE or most aftermarket self aligning rockers. Will also work with modified heads with screw in studs and guide plates


Requirements- Valve Seal replacement is highly suggested. It's important for the installer to make 100% sure the seals are fully seated down on the guide. Seals which are not fully seated will reduce maximum lift capacity. It's the installers responsibility to take measurements between retainer bottom and seal top to verify there is suitable clearance.

Vortec heads normally use: 11/32" X .552" seals but we have seen some guides measure up to .558".  Other seal sizes are available under the 11/32" positive category.

NOTE-1- Spring installed height must be measured and shims added as required to meet target installed height.


OPTIONS- Buyers may add a hardened shim pack or premium viton valve seals by clicking the option boxes towards the top of the page.


Alex's Parts- The smart choice in valve train parts~

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