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Message: <blockquote data-quote="96blak54" data-source="post: 1385156" data-attributes="member: 14727">Dont bowl hog them. Better to just lap the valves. Those seats have been cnc'd by a million dollar machine that shapes the seats properly to the ports purpose. Disturbing any of the angles will kill it. We think the factory valve work is the same as a machine shops, but its not. The factory actually uses a boring bar type cutter that is kind of a 5th axis allowing a very detailed shape. For instance, the left side of the seat has more cut than the right side at the same angle. Also back cuts on the seat towards the port before the 45Â° valve angle and machine shops cant replicate this. Its all there to help the rush swing around the seat without fuel tracking. Hope this helps!Sounds like this build will fall into place easily with all your great scores with good parts!</blockquote>