What is accepted tolerance for new aftermarket valve springs?

crackedback said

I was getting at the shorter inner and have seen people test multi spring untis without a retainer. Looks like you were correct in your test set up.

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yeah, but I did make that mistake at first! Was testing them without a retainer - (still 'green' haha) Until a fellow in the machine shop pointed out that the inner spring needs the retainer to give the complete even load.