Who makes this spring kit?

[Kenny_Kline]

Trying to figure out who makes these springs. My guess is Manley.

They are dual springs with titanium retainers. Anyone have an idea? Anything I can check to find out?

I want to install GSC S2 cams and want to be sure they can handle them also needs specs on springs for installation purposes.


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[Kenny_Kline]

 

[tektic]

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[Kenny_Kline]

For proper installation, I need to figure out the brand even for stock cams

 

[FlyingEagle]

You can set them up in a valve spring press that measures the tension at varying heights.

This way you can match springs in batches, assuming more than the minimum to install to one cylinder head.

Should be able to get the springs shimmed to create a proper/consist seat pressure also.

I can't tell you who makes the springs.

What RPM are you taking the motor to?

Stock EVO 8/9 beehive springs are good well past factory redline for an early 4g63 head, and you have dual springs.