i have the yellow stripped ls6 springs so are those good up to .570?

its kinda a faded yellow stripe, not bright. I just wanted to make sure those hold .56x lift

 

LS7's will support .600" max lift....I'm pretty sure the LS2's will support .600" as well but PLEASE don't quote me on that until I find out for sure !!

 

thanks.. i was trying to figure out which i had now.. they are the faded yellow stripe ls6 supposedly...

 

Yeah...you've got LS6 springs, they're good to about ~.560" lift so you "may" be able to get away with .565" before hitting coil bind. You could put them on a spring tester and see where you hit coil bind.....

 

When I was researching valve springs, I found a bunch of info on LS1Tech mentioning not to use LS6 springs for cams with aggressive ramps, as the agressive ramps require more seat pressure. If my research is correct, some various spring seat pressures are as follows:

Yellow LS6
Installed pressure - 90lbs@1.800"
Open pressure - 280lbs@1.250"
Coil bind - 1.160
Max lift - .570

Comp 918
130@1.800"
318@1.200

Crane Duals
112@1.800
352@1.150

I guess the best thing to do is ask the cam manufacturer/grinder what their spring requirements are...(I'm sure they'll tell you that you need their springs, but maybe if they give you some seat pressure info, you can decide for yourself)

I know that alot of Lingenfelter cams recommend LS6 springs, and the SDPC/Crane 220/224 .551/.551 also recommends LS6 springs. I'm assuming that these cams have less agressive ramp rates.