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Product Description

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

Valve Spring Kit for SB Chevy Vortec

 High Performance Hydraulic Roller Cams, up to .550" Lift


Our Vortec kits are engineered specifically for Iron Vortec & 96 Iron LT1 heads. (not aluminum LT1)

That's right, no machine work required to set up a pair of these heads.

We engineered this kit with all the right parts so Vortec head owners won't have to machine the spring seats or valve guides to run up to .550" lift.

Great for engines with 1.6, high ratio rockers.

Yes, works with self aligning rockers as well as heads w/ screw in studs and guide plates and std, non self aligning rockers.

As some of you know, 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 .550" lift, all with parts which fit the heads without additional machine work.

We use a special retainer and spring combination which solves two vortec head problems.


  1. The retainer to seal clearance issue.

  2. Spring base diameter issue (vortec heads will not accept std SBC springs)


The issue with clearance between the retainer and seal was solved by producing a special retainer which offers maximum clearance between the bottom side of retainer and the top of the seal. The bottom of the retainer is pretty much "flush" with the bottom edge of the locks. This design offers maximum clearance without compromising strength or requiring the guides to be shortened.

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

Both problems solved!

Stock valves have .260" IN/.289" EX Tip lengths which will generally allow for up to .550" lift.

It it durable? Yes!

This same kit is running on well over one thousand engines world wide.


         Kit Includes:

  • Sixteen- High Output Drop In Fit Valve Springs
  • Sixteen- Chrome Moly Retainers, 7 degree
  • Sixteen- 7 Degree Hardened Valve Locks


For 130 Lb seat pressure, we recommend purchasing a shim kit to facilitate setting up the proper installed height.

Due to the fact vortec heads were made in several countries, (US, Canada and Mexico) it would not be possible to offer a kit which could be installed without making sure the target installed height was correct.

To obtain optimum performance, installed heights must be measured and shims added as required. Not only with our kits but with ANY performance valve spring kit.

Recommended seat pressure for High Performance Hydraulic Hyd Roller cams is 130 Lbs however, those running really mild performance cams can use lower seat pressures such as offered with or VSK600VFT kit which offers 110Lbs seat pressure.

Please note that each kit comes with a card which shows the target installed height figure.     


  • Outside Diameter- 1.270"
  • Inside Diameter- .880"
  • 130 Lbs @ 1.785"
  • 340 Lbs @ .550" lift
  • Rate- 365
  • Average Coil Bind 1.150"

Kits for High Performance Hydraulic Flat Tappet or mild Hyd Roller cams can be found by entering VSK600VFT into the search engine.


Suitable for most hyd roller cams w/ up to 244 degrees duration @ .050"

Requirements- Valve Seal replacement is highly suggested. It's important for the installer to make 100% sure the seals are fully seated down onto the guide. Seals which are not fully seated will reduce maximum lift capacity. We recommend measurements are taken between retainer bottom edge and the seal top to verify there is at least .030" clearance exists.

Vortec heads normally use: 11/32" X .552" seals but we have seen some guides measure up to .558". If you need seals for .556"-.558" guides, check our seal selection for availability.

NOTE-1- Spring installed height must be checked and shimmed as necessary.

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

NOTE-3- We do not recommend the use of "HOWARDS" brand self aligning rockers. Due to their bulky design, clearance between rocker and retainer is either limited or non existent. The same goes for some older Crane self aligning rockers. Most other brands of self aligning rockers work fine. Be sure to verify suitable clearances exist.



There are two versions of shims available; Hardened and Std. (we recommend going with hardened) Our Viton valve seals fit stock vortec guide boss diameters of .552"-.556"(stock)

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