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Old 04-19-2021, 11:43 AM   #1
dethzombi
 
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LT2 Intake Manifold Modification Questions

I recently bought an LT2 Intake Manifold and am looking to do the modifications to it on my own. I feel comfortable with everything but the brake booster fitting, are there any detailed videos on drilling the hole for the brake booster fitting? I'm assuming I'm not supposed to drill all the way through the outer wall, if that's the case are there any tips for drilling into it?
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Old 04-19-2021, 12:26 PM   #2
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Here’s a good read for you.

https://www.camaro6.com/forums/showthread.php?t=579354
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Old 04-19-2021, 02:35 PM   #3
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Quote:
Originally Posted by Trochoidal View Post
So, I've read that, but it doesn't really explain what to do with the brake booster fitting. I get where it needs to be drilled and tapped, but my main concern is I don't want to drill all the way through if that's not what I'm supposed to do.
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Old 04-19-2021, 05:40 PM   #4
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The hole goes into the manifold. I wouldn’t let the drill but go any deeper than necessary to breakthrough the wall of the manifold. I measured 4-1/4” before the drill would come into contact with the #7 runner.

I put light in #8 runner so you can see it lighting up the booster hole.

I’m sure the drill bit will try to pull through when it breaks into the inner wall. That’s why you should use the shortest bit possible.

I let GPI do the mods on mine.
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Old 04-19-2021, 09:39 PM   #5
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I think this may work for you.
https://youtu.be/_DQdZ9rfQ68
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Old 04-20-2021, 01:03 PM   #6
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how thick is the manifold wall in that area? any one know? thanks
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Old 04-21-2021, 07:25 AM   #7
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Quote:
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how thick is the manifold wall in that area? any one know? thanks
maybe a 1/4 inch at best
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