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Due to their tall and skinny design, the Gen III intake ports are sometimes referred to as 'cathedral' ports. There is no performance secret to their unique design, it was simply the only way GM engineers could achieve the proper port volume while contending with the in-line valvetrain design and the four head bolts around each cylinder. The nylon EFI intake is only 3mm thick so you can't do much massaging to it, but the new cast aluminum intake will allow for some polishing. View Related Article
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