1g Intake manifold plugs

[T is for TURBO]

Okay, I've got a quick question. I was looking at my 1g intake manifold and I noticed that on either end (EGR side and opposite) there is a plug. The plugs are plugging a hole that goes all the way threw the intake manifold and intersects with the nipple that connects to the PVC valve and with a small hole in each intake runner. I would like to pull out the plug on the timming side and put a threaded barbed fitting in so I can hook my boost guage line up to it.

First off, is there any reason I shouldn't do this.

Second, Does anyone know what thread size it is off the top of their head? It looks like 1/4" pipe thread, but it's not.

Third, whats the deal with this setup anyway? The 2g one has a freeze plug it looks like. Which makes me believe that the 1g mani was used on another car that untilized this setup. Otherwise I don't understand why they would have spent the time and money to tap both ends.

 

[sd_ff22]

Those plugs cover the drilling that they had to do to make the manifold function the way it was designed too. You can only cast so many features into the manifold. After that, you have to machine it. they send a long drill bit down that port to intersect with the small ports inside the runners to make the PCV setup work.
I don't see why it wouldnt work to put a nipple there other than the fact that you would be taking your reading from a very small source (the 4 tiny ports in the runners). why not hook upi your boost/vac gauge to the FPR solonoid like everyone else? all you need is a vacumm "T"

 

[T is for TURBO]

I understand the machining process. (I work in the manufacturing process of heavy equipment) But why would they spend the extra time and money to put a thread on each end and plug it with a threaded plug. The 2G manifold uses a freeze plug style, which is MUCH cheaper and MUCH less time consuming. IDK, maybe thats why mistu can barely stay afloat in america...

Also, I'm going to recpectfully disagree with the size of hole agrument, as pressure is pressure, regardless of the size of the holes. It isn't going to be more or less in different parts of the manifold.

I was more concerened about getting too much build up overtime.

As for why I want to tap it there. Simple; one less place for a boost leak and it will make for a slightly cleaner looking setup.

 

[1992awdlaser]

Did you find out what size it is? I wander if my new map sensor will thread in there.