I have a 450whp gsr turbo engine.
Stock head
I rev to 8200rpm as it sits

With 85lb supertch springs what will I be able to rev to safe?
Are these springs just as good for a daily driver as stock?
Do I need retainers, keepers, and valves? or just springs?

Thanks.

 

depending on miles on the valve train, it's always best to replace evrything if you can afford it. otherwise replace the most worn parts as you fit.

 

I agree with rdeezy.... the springs will make it to 8200 if the rest of the valve train will.

 

can I install stock retainers with the supertech springs or is the spring rate to high to use stock retainers?

 

The springs normally come with the retainers I thought. If not there cheap enough were you should get them too. They are designed to work together.


-platinum

 

The springs that he has doesnt come with retainers, I have those too and i bought titanium retainers seperate.

 

retainers are $170 more then I can get springs for.