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Old 05-18-2008, 07:40 AM
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The only difference between the 062's and SOME 906's is SOME 906 vortec have a pressed in hardened exhaust seat as oppoesed to a factory flame hardened exhaust seat. The pressed in seat just flows a bit less than the other heads seat. Simple bowl porting (blending) under (deeper) the seat will eliminate any real or perceived difference in flow by eliminating the mechined metal "edge" left from the OEM manufacuring process.

A little hand blending fixes them right up.
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