I have found that even brand new ones act like that, in which they do not rebound to full extension. So calling them a vibration dampener is probably appropriate.

I did find, however, that my old ones were much easier to move in and out than the new ones. So what you're looking for is an engine shock that takes some effort to move in and out.

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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

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