LT1-LT4 Modifications 1993-97 Gen II Small Block V8

!EGR ! AIR??? help..

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Old 05-26-2007 | 12:29 AM
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Default !EGR ! AIR??? help..

okay guys...i finally got around to buying some longtubes...non emissions...what all do i need to delete the egr and air??
Old 05-26-2007 | 12:42 AM
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both the pipe and EGR valve ports can be blocked off with plates. GM p/n 10054880 (known as the LT4 block-off plate) can be used to block off the ports where the EGR valve is removed


I got this info from here
http://shbox.com/1/4th_gen_tech1.html
Old 05-26-2007 | 12:43 AM
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EGR Block off plates. 2 go on the back of the intake manifold. As for the Air, if you are going to non-emission headers all you need to do is remove excessive weight!
Old 05-26-2007 | 01:03 AM
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okay..my question now..is where and how much can i get the block off plates for?
Old 05-26-2007 | 01:12 AM
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I made my own.. I had the Intake off of it, so it was kinda easier..
Old 05-26-2007 | 01:19 AM
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Originally Posted by the_merv
I made my own.. I had the Intake off of it, so it was kinda easier..
is it necessary to take the intake off?? cause if it is i might just wait until i do my H/C swap...
Old 05-26-2007 | 01:22 AM
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H/C Swap?

as for it being necisary to remove the intake...no its not.....i would hit ebay and do a search for lt1 and goto the emissions section. I got mine for about 13$ shipped
Old 05-26-2007 | 01:25 AM
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head and cam swap
Old 05-26-2007 | 01:34 AM
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Ebay it up..
I had a set around here somewhere that disappeared
That is why I made my own.
Old 05-26-2007 | 01:46 AM
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yea tehy are pretty easy to make as it was said when it is of the car its a load easier. I jsut figured if i paid 5$ for a sheet of metal from Lowes and then I would have to measure and cut it and all taht junk....instead i jsut spend the extra few bucks to have a quality peice sent to me.

DONT FORGET TO PUT GASKET SEALANT ON IT. Ive read some people forgetting this and then comming up with issues later on
Old 05-26-2007 | 11:58 AM
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well they are all over ebay...15 bucks..not too bad i guess...
Old 05-26-2007 | 01:08 PM
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yea it eliminates frustration. because i know i woulda thrown a few air tools across the neighborhood trying to fab my own
Old 05-26-2007 | 02:10 PM
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Do you have to remove the EGR from the intake if you eliminate it from the exhaust manifolds?

I removed the AIR pump today and blocked off the drv side EGR. I didn't remove it from the head, just corked it. I need to get the brass fittings that were mentioned to really do it right. Anyone have the thread size for those again? :\

EDIT: Drove it once after I did the above, it seems to idle MUCH better now.

Last edited by Formula350; 05-26-2007 at 04:59 PM.




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