My valve springs (i believe they are patriot springs) were installed along with my cam 24k miles ago. Over this season, the car seemed to really be down a bit on power, my guess is i need some new valve springs? I am running a thunder racing 231/237 cam with .595/.605 lift, what would be a good set to pick up? thanks.

 

Since you are running a thunder racing cam...
Manley Dual Springs...from Thunder Racing

 

bumpski

 

What lobes?

 

TR uses comp cams correct? i believe i remember reading that they are pretty agressive lobes, a step below XER

 

have them tested.

 

they use their own lobe design

 

That's not true. I have one of their stroker cams and it's on XER lobes.

OP: If you think it has the XER lobes then it's relatively mild. If you really wanted to know you could grab a couple springs and go to a shop and have them tested

 

then they changed it, because the use to use similar lobes to Futural.

 

20k miles the springs start to go dead it is a maintaince thing with a cam that needs to be kept up on

 

I tell people to test at 9k~10K miles... or after 3 "3000 mile" oil changes

after the initial 10k check.. .I check them again every 5k after that