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Message: <blockquote data-quote="ForcFed93" data-source="post: 1428949" data-attributes="member: 7986">So after the install of my headers/poly motor mounts, I have a pretty significant vibration from about 11-1400 rpms.  After the motor is warmed up, the mounts seem to soften a little bit and ease the vibration but it's still pretty noticeable.  I'm sure it doesn't help that I also have poly rack bushings which transmits vibration from the K Member through to the steering wheel also.So my question is this:  Without removing the poly mounts how can I ease this vibration?  Will it reduce over time?  Will a quality harmonic balancer help?</blockquote>