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If you are going to port your TB, I used a simple technique that works great - way better than a Dremel. I used a sanding drum (largest diameter that would fit) in a drill press. I raised the table with the drum inside the TB until the drum almost touched the throttle plate, and sanded away the humps. Using this method keeps the TB square and the depth flush - it gave me a nearly perfect porting job. The only thing better is machining.

As a side note, I really didn't notice any performance or drivability improvements by porting mine, except that porting seemed to reduce the surging that my tunes had problems getting rid of. I suspect my surging was the idle air control, hunting on steady throttle between 2-3k rpm.
 

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That does sound like a good idea. I would have still used the Dremel because I do not have access to a press though.

I did use a Dremel sanding drum attachment.

I have an updated Ford Tune and there was a very noticable difference in my cars behavior after porting, much more responsive at small throttle openings.
 
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