Ok I am getting ready to bore my edelbrock TBI intake to 2". Beofre I attempt this I have a quick question. Upon a closer look there appears to be two openings that are att he top of each bore. They are a rough hole and have do to something with air since they are right under the TBI unit and in the bore. I do not want to cut to close if I will open this hole up. I may not bore it to 2" but instead to 1.75 with a chamfer to smooth out the opening. besides the fron tand rear crossovers does anyone know where the water passages go in an intake manifold. They wouldn't be near the bores would they. If they are I may have to rethink this.

 

I wouldnt worry about them to much, As long as u doing bore to much into them you dont have to worry about them cracking, a friend tried more then 2" he went to about 2.2 and cracked, so just a lil food for thought

 

He went 2.2 on the edelbrock one? Sweet!! I am not worried about cracking them but I am worried about uncovering another passage that is not suposed to be open. Like a water passage. That is what I have heard. The one bore only needs about 3/8" deepness of material to be moved but the onter one needs about 2" or so. That is the one I am worried about.

 

I believe those are EGR ports. Just blow in it and see where air comes out ...or you could use an air compressor, I just think it would be more fun to make a flute out of your intake :lala:

 

Well if it is EGR than I can relax. I plan on getting rid of the EGR so that won't be an issue. However that makes a lot of sense now.

 

It IS the EGR. I have one bored to 2.040 safely. It's for sale cause I can't bore this thing for my 1.75 dia distributor.

edit: just noticed yours is Edelbrock. Mine's a stocker.

 

Yea I am really trying to find someone with a bored edelbrock one. those EGR passages are sort close and I do not want to make them bigger. I heard through someone that their buddy did it safely to 2.2"

 

I don't think the size of those outlets really matter, I mean they can only flow out what they get in and that's controlled by the EGR valve...but I could be wrong.

 

If you plan on getting rid of egr just fill them with jb weld like I plan to do.

 

Thats a good idea.

 

BTW, on my LS1, I have a ported stock throttle body, with jb weld covering the huge gap the factory put in it and everything is fine. JB weld is good stuff.

 

What exacty is JB weld?

 

shifty, jb weld is basically a cold welding product. it comes in two parts and you place one part on the area, mix in the next and mix them together and a chemical reaction occurs making a "compound as hard and tough as steel ". kyle used it on the f.o.r.d on the gas tank, b/c the idiot who had it before him put an amp in and just used drywall screws in and screwed them in which punctured the gas tank. he said it still is holding well to this day and is very easy to use. here's the website. http://www.jbweld.net/coldweld.html

 

a thought just occured to me, you may, big may, but you may be able to use this on that spot where the hanger ripped off. but that's just a thought.

 

Hey thanks man, you learn something new everyday. I saw a post where someone made an air foil out of it for their LT1. I have heard that it can flake over time.

 

If all else fails go and get a Holley/Weiand 300-66.

 

That's what I'll be using.

 

Here is a pic of what the inside of my throttle body looks like. You can see where the jb weld filled in the massive gaping hole in the stock throttle body and smoothed it out pretty well. It holds up great and is rock solid.

http://www.bauer-racing.com/throttle...pe%20Front.JPG

 

Hey wow thats looks great. Is the JB wled the brown spot with the two drilled holes in it? If it isn't than you did a great job of blending it in.

 

yeap, that's the jb weld. Unfortunately, that is not an actual picture of my own throttle body. That is just an example, but mine looks almost identical.