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

Valve Spring Kit for Chevy 4.3 V6 Vortec

 High Performance Hydraulic Roller, up to .550" Lift

Current processing time is around 30 days. This means the spring kit will ship around 30 days after the order is received.

 
This valve spring kit is engineered to fit Iron 4.3 Vortec engines w/ hyd roller. We also offer the kit for 4.3 engines w/ flat tappet cams, check our other listings or write.

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

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 .550" lift Hyd Roller cams using our custom designed retainers, springs & locks.

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 at the factory 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 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 ten 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)

       Specifications:

• Outside Diameter- 1.270"
• Inside Diameter- .885"
• 130 Lbs @ 1.775"
• 318 Lbs @ .500" Lift
• 340 Lbs @ .550" Lift
• Rate- 378#
• Average Coil Bind 1.125"
  
• Beehive Spring? - No
• High Perf Replacement Spring? -Yes
• Kits for High Performance Hydraulic Flat Tappet & Mild Hyd Roller are also available.
  

Suitable for many Hyd Roller cams w/ up to around 244 degrees duration @ .050"

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 .556".  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.

NOTE-2- 4.3 Heads w/ double groove valves will need to change them to single groove valves as the second groove will reduce the available retainer to seal clearance.

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

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