Generation IV Internal Engine - LS3 vs L99 valve springs?

I did a search and can't find the answer. Are they different because of the different valves?

From what I read in a mag, the L99 uses solid intake. Which would mean different valve springs. I would try crossreferencing the OEM part numbers though. I couuldn't imagine why GM would use a heavier valve on a LS3 they know the public will rev the crap out of. Either way, I'd go aftermarket springs as stock LS3s are barely good enough for a stock engine.

I'm running patriod golds. I'm just wondering about these stock springs so i can accurately advertize them to sell.

What color are they? Fwiw, the same springs were used in the Ls2 and ls6 and the Ls2 had heavier valves.

What color are they? Fwiw, the same springs were used in the Ls2 and ls6 and the Ls2 had heavier valves.

they're just natural metal. not yellow or anything.