LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

cap/bolt sizes for AIR removal

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Old May 27, 2004 | 01:53 PM
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cap/bolt sizes for AIR removal

what r the caps or bolt sizes i will need to block the holes after removing my AIR pump..i have mac headers.. i know i need one for the intake manifold (what should i use and what size) then what else? thankyou...i plan on doing it today but wanna have the caps and blockoff components b4 i start
Old May 27, 2004 | 02:07 PM
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see this pic..this is from zmydust.com and this rubber tube on my car is bent to the right and connected right back into the intake? Guess i wont need a cap for the intake huh?

http://zmydust.com/images/airpump/PA110030.JPG
Old May 27, 2004 | 02:22 PM
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Not sure what hose you are talking about, but that is not a picture of a 94. It is a 95 or newer. On the 94, the PCV valve has a u-shaped hosed that curves right back into the intake manifold. That has nothing to do with EGR or AIR.

Most AIR connections on single cat headers are 22mm threads, and can be plugged with M22 oil drain plugs. You will also need a 5/8" vacuum cap to cover the AIR pump supply connection on your air intake system. That is it for AIR.

For EGR, you need to cap the connection on the #8 header tube, the place on the back of the intake where the corrugated tube from the #8 tube connects, and if you remove the EGR valve itself, you need a blocking plate for the resulting hole. These are not a simple matter of screwing a bolt in the hole. You need to fabricate blockoff plates, or order them from someone like SJM Manufacturing.

Then you pull the EGR vacuum hose off.... the thin hose with the elbow that heads off to the right in the picture you posted, and put a vacuum cap on the nipple on the manifold. Your connection, being a 94 will only be a single elbow at that point, not the two connections shown in the picture.
Old May 27, 2004 | 02:22 PM
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i love replying to my own posts....

heres a pic and a couple questions on my domain...how the hell do i unscrew the tube out of the MAC header? Its like welded in there i feel like..that or its not gonna come out..HELP
Old May 27, 2004 | 02:24 PM
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sorry heres the pic

http://camaroz28.cardomain.com/memberpage/464648/8
Old May 27, 2004 | 02:29 PM
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thanks fred..i am only doing the AIR removal...so i need (2) m22 oil drain plugs for the headers (which i cannot get out)...a 5/8 vacuum cap for my CAI and what else?
Old May 27, 2004 | 02:45 PM
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ok...ive come to the conclusion that i am never going to get those tubes screwed into the top of my MACS out...can i just pull off the hose and cap there? leaving the metal tubing to the headers in place but taking all the rest of the AIR system out...what should i use to cap there? heres a pic..the bottom 2

http://camaroz28.cardomain.com/memberpage/464648/8
Old May 27, 2004 | 03:37 PM
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cut the pipe right above the bolt and then use an impact wrench to get it off.
________
Gisselle live

Last edited by MarkyMark; Sep 14, 2011 at 01:21 PM.
Old May 27, 2004 | 05:09 PM
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good idea...what would be the best to cut those pipes? Also where could i rent an impact wrench as i have an air compressor
Old May 27, 2004 | 05:14 PM
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and even if i couldnt get the pipes unscrewed after i cut them...i could just plug right there right?
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