Little Big Chief - Part I: Basic Machining - Pontiac Tech
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With the guides back to specification and the cylinder head porting complete, a dedicated head shop machine was used to accurately cut the valve angles into the seat. This tool references from the valve guide so that dimension must be exact before the angles can be cut. It's the modern method of producing the valve angles on the seat and is far superior to using grinding stones. The intake seats were cut at 30, 45, 60, 75 and 82 degrees. The exhaust seats were machined for 30, 45, and 56 degrees and to a 4mm radius. View Related Article
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