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The shim-over-bucket design of the stock 4AGE. Valve shims sit on top of the buckets, which push down on the valves. As the cam lobe swings by and pushes down the buck, the valve will open. If the lobe profile is too aggressive, there is a chance of flicking the shim out of the top of the bucket. For lifts beyond 9mm, Toda recommends switching to a shim-under-bucket design, where the cam acts directly on the bucket.
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