When it comes to dress-up kits and such, what looks cool or personal preference rules. But internal engine work is all about precision and accurate measuring. Valve spring heights aren’t an exception to that rule, and guesstimating won’t cut it. You need a valve spring micrometer.
When it’s inserted over the valve between the spring seat and retainer (as if it were a spring) the threaded members provide sufficient axial pressure (just like a spring would) to enable an accurate measurement of critical valve spring heights to and accuracy of thousandths of an inch.
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