Why so much milling on the intake side? Could be because the heads were used on a NHRA Super Stock engine for example. Rules require a certain intake port volume...so milling the intake flange decreases the port volume allowing the enterprising engine builder to increase the volume where "needed" namely below the valve seat. With a nice big 75 degree bowl cut under the valve seats, the flow increases 25 cfm...and the power follows. :-)
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