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  #1  
Old 11-14-2012, 10:27 PM
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Doesanybody know the standard bore of the throttle body. I want to bore mine out next weekend. And polish it all up. Was just curious what size it is to start with. And how far I should take it. Also has anybody else done this. If so any insight would be great thanks.
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Old 11-14-2012, 10:49 PM
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2011 hemi?

IIRC it is 80mm. Some are 81mm I believe, but I think those are found on earlier hemi's IIRC. If you bore it you have to make a new buttery, it has to be VERY precise to opearte correctly. If you just polish it you will be ok, or if you widen the mouth(make it cone shaped) so the butterfly is still 80mm, you will be fine. Just be careful around the butterfly, if you take off material air will get by and you will have issues.

Fastman does a mod for like $150 IIRC.
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Old 11-14-2012, 10:57 PM
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80mm is the OEM throttle body's butterfly size, but the initial opening is around ~83mm.
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Old 11-15-2012, 12:07 AM
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I only planned on doing it to the butterfly. When I do the top by the air tube. Should I do the bottom side too. Or just air intake tube side?
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Old 11-15-2012, 07:50 AM
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You mean up to the butterfly? If you enlarge the bore at the butterfly the truck will not idle or run correctly.
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Old 11-15-2012, 11:32 AM
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correct. i'm not doing where the butterfly is. i'm just going to get close to it. without messing up the seal the butterfly makes. my question on that was since i have it off should i do the topside and the buttomside of the throttle body or just the top.
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Old 11-15-2012, 11:50 AM
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ok gotcha. You could do the backside(manifold side) to match the same size opening as the manifold(if possible). Don't go larger though. The engine side of the TB isn't as critical as far as diameter, but definitely still polish it.
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