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Old 06-08-2009, 04:45 PM
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V6 STI are Shim under bucket which is just as good as shimless unless you plan on pulling 9,000 rpm often, the bucket retains the shims so unless the bucket is shattered the shim cannot move or become dislodged.

Cheaper too as you only have to purchase the shims to set up the valve lash as opposed to the complete (varied thickness) buckets for shimless.

The shim is there to set the correct valve to cam lash, each one will be a different thickness to the next.
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