Performance Head Build - Some Assembly Required
When the layout dye is dry, each valve was placed against its seat and twisted for approximately five seconds with a lapping stick. In addition to verifying fit and seal, lapping will improve both by removing ultra-fine imperfections. It won't, however, cure something more serious, like a burnt valve. You'll know a burnt valve, says Alvarez, because it will actually be missing a small piece of material.
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