Thread: hesitation on a 350

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Eh, I doubt it. Where those springs may fail is when you start twisting the higher RPMs, then you may see something. It's always best to keep the springs as matched as possible with the cam manufacturer's suggested ratings be it with their springs or some other manufacturer.

Do you have a vacuum gauge? If not, get one. One that's used for tuning. I believe Sears-Craftman still makes theirs and that's the ones I've been using. This gauge can really aid in tuning and troubleshooting. Might be able to tell us what's going on.

I'd still check out those springs and make sure they will work with your cam, or switch them out, either way it eliminates any probability. Just watch for coil bind if any is suspected and make sure the installed height is correct.