No... you have to run LS6 springs and retainers. L67 retainers will not work and will cause valvetrain problems. Thats how Intense screwed up a few motors years ago, they didn't know this fact. Physically, yes they'll bolt up, but long term no they won't work.
IIRC, LS1 and LS6 retainers are the same but i'm not 100% sure on this, I heard this though. Research and find out. To be safe though, i'd go through Pace or your local dealer and order 02+ "Yellow" LS6 Valve Springs and Retainers. While your in there you might as well replace your valve seals too, I would, there easy and accessible. You'd hate to tear it back down in 50,000 miles to pull off all the springs again to perform this maintence wouldn't ya? Get OEM intake and exhaust seals or get the PRJ Viton ones, there really nice and better than OEM I think. Welcome to PRJ.Performance
