HOW-TO port your throttle body...
 

I FOUND THIS ON THE INTERNET!!!


Porting your the throttle body is a simple way to pickup some extra horsepower and if you already have some simple tools, it's super cheap. All you need is a dremel (or similar cutting tool) with some cutting bits, some sanding rolls, various grit sandpaper, and some quick dry metal filler of some kind (optional).
Here is a picture of the stock throttle body that we'll be working with. Our goal is to open up the area in front of the throttle blade including the front lip. You can also fill in the huge cut out area at the top (optional).

http://memimage.cardomain.net/member.../993398_85.jpg
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First off, you need to mark the throttle body at the blade with a marker so you be sure not to go past the blade into the backside. This is VERY IMPORTANT. If you go too far and it will not allow the throttle blade to seal and cause idle problems.
If you also plan to modify the throttle shaft (optional), you will need mark the shaft at each end where it goes into the body, like in the picture below.

http://memimage.cardomain.net/member.../993398_86.jpg
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Now disassemble the entire thing. Remove all the connectors, unscrew and remove the blade, and remove the shaft. After you take off the tps, you can simply whack the shaft out with a hammer. Don't feel bad it won't hurt anything. ***Pay attention as there is a very small washer that will fall out on the tps side too, do not lose this!!***

http://memimage.cardomain.net/member.../993398_87.jpg
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Optional: Now you need to fill in the cut out area that goes into the idle air bypass. I used 2 pieces of stainless tubing inserted before I filled it with metal filler. You can simply drill the holes later if you need to. I also put a piece of aluminum can against the opening and cut out 2 holes for the stainless tubes to slide through. This way the metal filler will not completely fill the cut out area and choke it off.

http://memimage.cardomain.net/member.../993398_88.jpg
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Optional: While that's drying, go ahead and knife edge the throttle blade. I used a bench grinder, but you can use the dremel if you choose. Also, round the back edge of the blade off "airflow off the back is as important as the front".

http://memimage.cardomain.net/member.../993398_89.jpg
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Optional: Now move over to the shaft and get ready to cut it. What you will be doing is cutting off the front portion that you see when looking at the throttle body head on. When the blade is opened up this makes a big bump and a big restriction. Reference the marks you made before you took it apart and cut there.

http://memimage.cardomain.net/member.../993398_90.jpg
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The shaft will look like this now:

http://memimage.cardomain.net/member.../993398_91.jpg
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If you used metal filler, make sure it is dry. It's now time to start porting. It will take a while, but be patient and be careful, making sure not to go too far into the throttle body (keep an eye on the mark where the blade will sit). Knife edge the leading edge of the body and grind back to your mark. Pay attention to the area near that mark, as there is a "lip" right there that is a major obstruction to air flow. You are able to feel it with your finger. Your rough cut should look something like this (if you didn't use the stainless tubes, that area will be solid filler):

http://memimage.cardomain.net/member.../993398_92.jpg
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Be sure not to go past your mark!!

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RE: HOW-TO port your throttle body...
 

That looks very do able. Who's first?
Have you seen any for porting the MAF?

RE: HOW-TO port your throttle body...
 

Not yet, I'll look....

RE: HOW-TO port your throttle body...
 

I just wanted to revive this post. I am thinking of starting on it this week end. Has any one elso tried this yet?

RE: HOW-TO port your throttle body...
 

Not yet.

RE: HOW-TO port your throttle body...
 

no, no time yet.

RE: HOW-TO port your throttle body...
 

Mine is ported but I didn't do it personally. There's a guy here in Texas that I used that does them for around $150.

RE: HOW-TO port your throttle body...
 

how did it work for you?

RE: HOW-TO port your throttle body...
 

Great. Similar to when I first put my cold air intake on, it took a while to figure out idle and all - which obviosly means it's letting in more air, so I'm pleased with it. I was also having some issues with a bad fuel pump and bad knock sensors at the time, so there wasn't an immediate feeling of amazement. But I think it was well worth the money.

RE: HOW-TO port your throttle body...
 

refresh as i am doing this right now

RE: HOW-TO port your throttle body...
 

Does the 4.3 have a throttle body like the v8's???

RE: HOW-TO port your throttle body...
 

no, it's different but the concept is the same. I am posting pics and skipping some step but I'll post a v6 how to as well.

I know this is ging to be a great mod because there is a weird bubble shield thing attached to the throttle body blade that was only allowing about 60 % flow. it will show up in the pics tonight. I will be posting in a few hours

RE: HOW-TO port your throttle body...
 

Shweet

RE: HOW-TO port your throttle body...
 

He hardly took anything off of the throttle body.... I can't justify paying someone $150 for that. Why not put $150 towards a more worthy mod? I also can't justify spending however long in the sweltering heat to take off that little bit myself... There must have been a lot of dope smoking going on during this idea's creation and follow-through.....

RE: HOW-TO port your throttle body...
 

check out the crap that was on the back of my throttle body and you will see that it made a huge difference! the pictures don't really do it justice either.

As far as the money goes, you are right there is no way I would pay for this to be done. I know that it has made my truck run like a hell of a lot better but it might not be for everyone.

RE: HOW-TO port your throttle body...
 

Reviving this thread again...anybody else try this? Where can I find the pics mentioned in the earlier post (popo)?

RE: HOW-TO port your throttle body...
 

https://www.truckforums.com/m_17998/mpage_1/key_/tm.htm

here is the link to mine hope it helps. I haven't posted in a very long time.

RE: HOW-TO port your throttle body...
 

I have been having some problems witha very harsh take off as soon as i hit the gas. I just noticed that in theirs, they left the little hole on the blade open and i closed mine, i wonder if that is what was making my throttle sticky? I'll check it and update.

RE: HOW-TO port your throttle body...
 

Well I have the opportunity to buy a stock TB off the same year 5.3 for $40. I was thinking about trying this myself. What all will I need? DO you think filling the holes with metal filler is worth it? What if you don't have a dremel tool?

RE: HOW-TO port your throttle body...
 

you definitly need a dremel. i looked at mine again and i did actually leave the hole open on the blade. i would say do this mod cause you have a replacement if anything goes wrong. I would not cut off the part that hold the blade in place if i could do it again tho. it is worth it but with out the proper tools you will be spending an enormous amount of time.