Suck, Squish, Bang, Blow: Part 4
Port work on most modern, high-output engines is usually limited to detail work, but this example is fairly radical. The intake port on the right of this Mitsubishi 4G63 (Eclipse turbo) head is stock, while the other three show various stages of the CNC machining process used by BCE Racing Heads to make the intake ports roughly equivalent to a Lancer EVO VI intake port. The same work, of course, could be done by hand.
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