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LT1 Valve Spring Kit, Mild to Moderate Cam Profiles, 120 Lbs Seat Pressure

  • Pictures are not of actual parts.
  • Includes: High Output Drop in Springs, Retainers, Locks and Cups.
LT1 Springs do not have a damper as shown.
Pictures are not of actual parts.
Calculated at checkout

Product Description

For mild to moderate cam profiles

High Performance Valve Spring Kit for SBC LT1 w/ Aluminum Heads, 120 Lb Seat Load

Hydraulic Roller Cam Applications, up to .550" Lift


This is one of our popular High Performance valve spring kits for LT1 aluminum heads. It produces 120 Lbs Seat pressure.

We offer two different LT1 kits, this one is for mild to moderate cams with no more than .550" Lift and 228 degrees duration @ .050"

(Also available in a 135 Lb seat load variety under part # Vsk4j21)

A great way to set up your LT1 for increased RPM power.

         The Kit comes with:

  • High Perf Drop in Valve Springs
  • Chrome Moly Steel Retainers, 7 Degree
  • 7 Degree Hardened Valve Locks
  • Valve Spring Base w/ 16 Hardened Shims or Hardened Spring Cups w/o shims (one or the other)

Can be used with high ratio rockers as long as the lift does not exceed .550" lift @ the valve.


  • Outside Diameter- 1.265"
  • Inside Diameter- .880"
  • 120 Lbs @ 1.770"
  • 308 Lbs @ .500" Lift
  • 328 Lbs @ .550" Lift
  • Rate- 376#
  • Average Coil Bind- 1.160"
  • Springs do not have a damper


Custom made in the USA- Good stuff indeed!

Will also work with the stock cam including when running high ratio rocker arms.

Suitable for mild to moderate hyd roller cams with up to 228 degrees duration @ .050"


Those looking for springs with higher pressures, search for item # Vsk4J21


Requirement- Valve Seal replacement is required when installing this kit. Valve seals must be removed in order to replace the old spring base's with the new spring base or spring cups included in this LT1 spring kit. The stock spring bases can not be re-used, they must be replaced so you will need new valve seals to complete the installation.

If you do not have new valve seals, we suggest purchasing a set of our fine Viton seals.

LT1 engines use a unique seal size: 11/32" X .558"

Not for Iron LT1 heads. If you have a pair of mid 90's iron LT1 heads, use our vortec spring kit for those. Part # Vsk4h53 which fits iron LT1 used in mid 90's Impala engines.

Note 1. This kit can take extra time for us to test and put together. Please allow around 7 days for shipment from order date.

Note 2. When using self aligning rockers and aftermarket valves, the valves must have the stock tip lengths of .260"/.289", not .250"/.250" aftermarket valves. Anyone interested in replacing valves should check out our 1.94"/1.50" stainless valves w/ .260"/.289" tip lengths.

Alex's Parts- Excellent Quality at a Good Price~

Warranty Information

All components guaranteed against breakage for 6 months from purchase date.

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