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Valve Spring Kit, SB Chevy VORTEC, Hi-Perf Hyd Flat Tappet, 110 Lbs Seat Pressure, VSK4H50

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Product Description

 Drop in fit, .550" Lift, SBC Iron Vortec

Valve Spring Kit for SB Chevy Vortec

Fits: High Performance Hydraulic Flat Tappet & small hyd roller cams


Our Vortec kits are specially engineered for Iron Vortec &  96 iron LT1 Impala heads. The parts go on without the need to machine anything. That's right, no machine work required to set up a pair of iron vortec heads.

We engineered this kit with all the right parts so Vortec head owners won't need to take them to a machine shop.

Works with stock or with most aftermarket self aligning rockers.

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 up to around .550" lift using our custom designed retainers, springs & locks.

Our vortec kits solve two common problems on these heads.


  1. The retainer to seal clearance issue.
  2. 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 machine at the factory so the bottom edge of the retainer is close to the bottom edge of the locks. This is what gives the added clearance between retainer and seal without the need to machine anything.

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

Both problems solved and no machining required!

It it durable? Yes indeed! These kits were engineered over 15 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 Includes:

  • Sixteen- High Output Drop In fit Valve Springs
  • Sixteen- Chrome Moly Retainers, 7 degree
  • Sixteen- 7 Degree Hardened Valve Lock pairs (32 Pcs)


We recommend having a hardened shim pack on hand to facilitate setting up the installed heights properly.


     Spring Specifications:

  • Outside Diameter- 1.270"
  • Inside Diameter- .880"
  • 110 Lbs @ 1.790" (See *Note at bottom of page)
  • 298 Lbs @ .500" Lift
  • 318 Lbs @ .550" lift
  • Coil Bind 1.125"
  • Beehive Spring? - No
  • High Performance Replacement Spring? -Yes
  • Part # Vsk4h50 for engines w/ vortec heads


Good for Hyd Flat Tappet Cams up to 246 degrees duration @ .050" on the intake and small Hyd roller cams up to around 218 degrees duration @ .050" on the intake.

Due to the fact vortec heads are manufactured in several countries, (US, Canada and Mexico) it is not possible to manufacture the parts to install without the need to measure and set up the installed heights with shims. Production tolerances vary too much to make one kit fit all the different production runs so be sure to measure the installed heights. Installed height tolerance is: -.010"/+.005"


Order processing time: Since all our valve spring kits are custom built after order and are not sitting on the shelf, please allow up to 7 days for us to build and ship your order.


Requirements- Valve Seal replacement is highly recommended. It's important for the installer to make sure the seals are fully seated down on the guide. Seals which are not fully seated will reduce maximum lift capacity.

OE GM Vortec heads normally use: 11/32" X .552" seals. (.552"-.555") Be aware some aftermarket heads (such as engine-quest) have different guide diameters. If you have aftermarket iron heads, it is advised to measure the guide diameters in advance.

* This kit also works with some Hydraulic Roller cams. Spring output is around 30% higher then stock springs which improves performance even when running a stock cam. A good choice for mild performance, RV and torque Hyd Roller cams w/ up to 212 degrees duration @ .050"

NOTE *- Each spring kit comes with with it's own installed height spec card. When setting up installed heights, use the specification listed on the 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 the kit has shipped.

NOTE-1  Spring installed height should be checked and shimmed if necessary.

NOTE-2  Not for Gen III LS series Vortec. Check our spring kits for late model Gen 3 applications

NOTE-Stock vortec valves have .260" IN/.289" EX Tip lengths which made it possible for these heads to use self aligning rockers. Do not use with aftermarket valves that have .250" tips, doing so greatly reduces the clearance between rocker arm and retainer/locks.



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

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