Editing Porting cylinder heads (section)
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==Valve job== A three or more angle valve seat is best for flow. Most shops today use a multi-angle cutter that does at least three angles all at once. This is an acceptable method for most performance engines, but a skilled machinist can use individual stones to give a superb result, placing the angles exactly where they need to be. This method also allows the seat widths to be set by the machinist and not the tool. [[File:Multiangle valve seat.jpg|500px]] ===Replacement valves=== [[Media:Manley catalog valves.pdf|'''Manley valve catalog''']]
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