Negative Height Valve Spring Retainers

Newbomb Turk said

There is always the issue of not getting the exact amount of change you want.

I’ve seen the .100 up stuff be as low as only .070 and I had some back in the 1990’s that were .125 up.

Other than that, it’s not usually an issue.

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You were right about the lock height variance. Just changed out Comp 612 locks (standard height) for Comp 609 locks (advertised as -0.050"). The minimum change in spring installed height was -0.071" and the maximum was -0.102". Average change was -0.087". In this case it worked out perfect because I needed about -0.100" anyway.

And within the group of 609 locks themselves the variation in installed height was at least 0.020". In other words, just changing from one pair of 609 locks to a different pair of 609 locks could change the installed height by 0.020".