Originally Posted by jwalters
Last try: it doesn't seem crazy that your valve lapping compound could have removed the .15mm. You might want to try the same procedure on some scrap and measure the difference.
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I agree with the first part; yes the compound would/will remove material. But that would move the valve further into the cylinder head/valve face. Which would push the stem further up into the shim/bucket/cam assembly. Thus, reducing the clearance between the top of the bucket and the camshaft.
But my clearance increased......
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