Lars87

I am helping a friend with this 2002 C5 Z06.
The car was running really BAD, and I found the problem to be a broken valve spring.
I ordered some new stock valve springs, but then realize that this car has been modified, so these springs does not fit.
The owner has very limited knowledge about the cars mods, but we have the following information.


Stage 3 heads CNC LS6
Cam 228/232 with 587 lift
Manley valves
Titanium retainers
Roller Rockers arms 1.7
X-pipe
Hooker headers

I measured the springs (out of the car) outer diameter is 32mm and height is 53mm.
I dont know what brand and part. No these are.
Below is the valves from Cyl #3



Can anybody tell me what valve springs to order for this car?

torkman15

If it were me I would buy a set of Comp 918s and Ti retainers, swap them and forget about em'. I have run 918s and 921s with mondo cams to the moon and never had any troubles. GOOD parts, very reasonably priced and they fit most any LS application so there's no Corvette tax. Good luck.

Lars87

Would these 918´s fit this car and in mods, and could i use the Ti retainers I have?

Lars87

Anybody have a guess what springs there are?

OR what I could mount instead, that is not beehive springs?

BHRZ06

Not a cheap option but id go with pac1521s they are a solid no issues dual spring.

vettenuts

I'm trying to figure out what you have. The springs appear to be beehive springs but the retainers look like they are from dual springs. That, if true, may be why you have a broken spring. Any part numbers evident? Do you know the prior owner who modded the car?

sprayed1998

Use a dual spring, patriot gold or the prc 650, why run a single and drop a valve

Lars87

I have not found any part no. on springs or retaines. The spirngs that broke are normal springs, and not beehives.
It is very likely that the reitainer is ment for dual springs, as the owner claimed there to be dial springs in the car. However its pretty evident that the springs are normal valvesprings.

I dont have contact to the previus owner, unfortunatly.

vettenuts

Any idea who might have machined the heads? That might provide a lead on the springs. You could also measure out the retainer and then check Comp, Crane, PAC and Manley for retainer dimensions. If you can identify the retainer then you can figure out what springs can be installed.