7

90# Valve Springs

SKU: 12625033-12

$69.99

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Safely increasing cam lift or maximum engine RPM will require new valve springs. For example on the 3800 we use LS1 "behive" valve springs which means that when running new springs you will also need our LS1 retainers.

These 90# springs are OEM GM LS6 springs. The LS6 engine comes from the factory with .550" of lift and spins to 6500 RPM to give an idea of what these springs were made for with factory reliability. The seat pressure is lower than the Comp Cams 105# springs but the spring rate is higher so they do work well for more aggressive ramp rates. There springs work well with the VS and NIC cams when shifting at 6000 rpm. Because of the higher spring rate, timing chain dampener life is lower than with the 105's.

Why install valve springs?

When boost is increased, that boost is pushing on the back side of the intake valves, therefore your actual valve spring pressure is reduced. So when you add valve springs it allows you to rev higher and increase your boost without losing any performance to valve float. If you are boosted and want to shift above 6000rpms, then we would recommend the Comp Cams 136# or Crow 130# valve springs instead.

Some users have reported that in naturally aspirated applications the LS6 springs have excessive noise and cause false KR readings at certain rpm points. However we have not experienced this.

1.80 recommended install height.

These are all packaged in sets of 12.

You are viewing a product listed on the following platform:

3800

Safely increasing cam lift or maximum engine RPM will require new valve springs. For example on the 3800 we use LS1 "behive" valve springs which means that when running new springs you will also need our LS1 retainers.

These 90# springs are OEM GM LS6 springs. The LS6 engine comes from the factory with .550" of lift and spins to 6500 RPM to give an idea of what these springs were made for with factory reliability. The seat pressure is lower than the Comp Cams 105# springs but the spring rate is higher so they do work well for more aggressive ramp rates. There springs work well with the VS and NIC cams when shifting at 6000 rpm. Because of the higher spring rate, timing chain dampener life is lower than with the 105's.

Why install valve springs?

When boost is increased, that boost is pushing on the back side of the intake valves, therefore your actual valve spring pressure is reduced. So when you add valve springs it allows you to rev higher and increase your boost without losing any performance to valve float. If you are boosted and want to shift above 6000rpms, then we would recommend the Comp Cams 136# or Crow 130# valve springs instead.

Some users have reported that in naturally aspirated applications the LS6 springs have excessive noise and cause false KR readings at certain rpm points. However we have not experienced this.

1.80 recommended install height.

These are all packaged in sets of 12.

Customer Reviews

5 Based on 7 Reviews

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MD

11/07/2018

Matthew D.

Amazing price

Looked many places for these same springs. This price is unbeatable anywhere. Great GM quality at a great price to allow high lift and high RPM shifts.

JW

08/27/2018

Josh W.

90 lb valve springs

Quality is excellent, shipping was fast as always. Thank you ZZP

BS

04/11/2018

Brent S.

90pd valve springs 1.9 Rockers and push rods

Came really fast still porting my 3800 heads so haven't had time to install everything or to check each springs compression rates to make sure all my spring and valves clearances are the same everything looks good why paint the springs blue don't really want the paint running through my motor but I'm sure that you guys already thought about that thanks ZZP I will post after everything has been tested all the springs clamping force is the same and how good the 1.9 Rockers work as you know the nock sensors are super touchy hopefully these Rockers don't tapp will see thanks again ZZP

HF

03/03/2017

Hunter F.

Good

GG

01/24/2017

Guest G.

Excellent

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