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The intake runner of the Stage I head has been extensively worked to now have 237 ccs of volume versus the stock LS6 volume of 210cc. Runner volume is only one factor in an efficient intake, as extensive R&D work spent hand porting and then testing on a SuperFlow SF600 flow bench yielded high port volumes without sacrificing power in the lower third of the power band. Need more proof? Look at the stock head versus PRC Stage I graph. At the lowest rpm level (3,000) the PRC head had a 10hp and 8 lb-ft advantage. View Related Article
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