crower turbo cams

[thermal]

You have to check the specs. Each company has their own version of machining their own valve springs, which is why they also recommend their retainers. This way, they can guarante that the grooves on the retainers are matched with the spring. It's kind of like a "pair". Chances are, what you have may work..... but why risk it? It seems like you've dropped plenty of cash on that head already.