Valve spring options
Valve spring insert/shims.
You can do these things a couple ways you can locate the inner spring to the guide by cutting or of guide to the diameter of the inner spring which most brands are made to Universal diameter of say .780 or .630 something like that.. and that in turn can locate the outer. Or you can use a a spring that fits inside the spring pocket of the head Or cut pocket to the size of the spring you're going to use.
Whichever way you do you don't want to not locate the inner spring and outer spring and have them able to scoot around.
