My UIM/(porting)LIM replacement thread 56k beware - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-17-2007, 12:48 PM   #21
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You didn't work all the way up to the UIM?
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Old 12-17-2007, 12:49 PM   #22
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You mean cut from top to bottom? I did what I could, the bit wouldn't let me in too deep.
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Old 12-17-2007, 12:53 PM   #23
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Forgot to mention, I did go in from the UIM side and went down. I got a good bit of material out of there just doing that. So yeah, for the most part there'* a good bit taken off.
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Old 12-17-2007, 12:53 PM   #24
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You work the ports from both sides.

http://www.bonnevilleclub.com/forum/...ic.php?t=72403

Pages 1, 2, and 3 all have detailed pics.
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Old 12-17-2007, 12:56 PM   #25
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So you think I should remove even more material? Brb... gonna get a pic of the LIM from the top side.
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Old 12-17-2007, 01:05 PM   #26
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Are you talking about possibly removing that lip you can see on the top?
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Old 12-17-2007, 01:09 PM   #27
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I think he might be referring to the polish part of porting and polishing?

To get the roughness out of the ports.
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Old 12-17-2007, 01:15 PM   #28
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Only thing I can really use is the drum sander bit. That thing likes to tear to shreds quickly though, not sure why. And I think he means smooth, not polish.
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Old 12-17-2007, 01:22 PM   #29
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Semi-smooth. Same finish as below. Get that dark rough crap smoothed out a little bit. You need a large carbide cutter with a rounded end. My favorite is a teardrop-shaped bit. The cutting head is teardrop shaped and is about 3/8" in diameter.
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Old 12-17-2007, 01:39 PM   #30
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Better?

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Can't get into the deep stuff without throwing the hole out of shape lol. But you can't feel it, so it'* ok.
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