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the Vortec heads are nice, theyll raise your compression to around 9.5:1 with flat tops, they flow great without major work.... but, they do need better springs, need machine work for higher lifts, also require a vortec style intake, rocker arms & valve covers...by the time your done with all that, might be better off buying a set of Sportsman IIs. a real good head for the money
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