almost impercievalbe reciprocating weight reduction.
the big thing is that since the shim is under the bucket, when using custom cam profiles (especially when using re-ground cams that require making up alot of distance via the shims). the aggressive cam lobe won't hit the shim ontop of the bucket & knock it off. which can happen.
so the high revving shim/bucket combo's put the shim under the bucket.
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