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cutting valve seats on a le top mill

Nov 26, 2004 6)Perform a quality valve job. Undercut and swirl-polish the intake valve head and grind a 30 angle on the face of the intake valve and seat only so more air/fuel will enter the combustion chamber. And for the exhaust to exit the combustion chamber quicker, undercut and grind a 45 angle on the exhaust valve head

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