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Speed Demon Motorsports ported throttle bodies are an excellent addition to your highly modified LS1 Engine providing more crisp throttle response and more power at higher RPM's! What we do is bore the throttle body orifice to a uniform size, allowing air to pass through unobstructed. We then polish the entire orifice to a high polish allowing air to more freely flow. The end result is a beautiful piece that can produce more power than a stock throttle body.
SDM-LS1TB Custom Ported and Polished Throttle Body for C5 Corvettes (sold on exchange $129.95
Speed Demon Motorsports Houson TX (281) 866-7000
Yes, you can open up the diameter of the TB, however DO NOT TOUCH anywhere where the TB blade closes. If you dremel that area then your idle will hang and your car will not run properly. Get some grinding stones and polishing pads to smooth out the lip in the TB before you get to the TB blade area and to open in up some. Then polish it up with the polishing pads ;). Works well. No dyno #'s, etc however it was a little peppier when I hit the gas. Unless you have cam and/or heads it wont really matter all that much whether your TB is ported or not.