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WiseAutoTools.com Summary: When it comes to repairing cylinder heads, eliminating line-up dowels can lead to several potential problems. Line-up dowels ensure precise alignment of the cylinder head with the engine block, which is crucial for proper engine function and performance. Using a kit like Time Sert that does not eliminate the use of line-up dowels is recommended. Additionally, using inserts with fine threads instead of coarse threads can provide better strength, precision, and r …