• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

LIM and M90 Supercharger port Mod

Flip97GTP

Flip97GTP

New member
I'm going to be modifying and Porting my Lower Intake Manifold and M90 Supercharger.

This are the tools and parts I'm going to be using.

For Porting M90 Supercharger and the endcap of the LIM:

Dremel Model 200 - https://www.dremel.com/en-us/tools/Pages/ToolDetail.aspx?pid=200+Series

For the LIM TB Coolant Passage Mod:

Here is a good write-up by BillBoost
http://www.grandprixforums.net/showthread.php?t=46931

IRWIN Adjustable Tap Handle & Reamer Wrench 12498
This is what worked best for me, but you can use whatever works best for you.
http://www.sears.com/irwin-hanson-irwin-hanson-585-12498-tr-98/p-SPM3222753201

IRWIN 1903 Taper Pipe Tap 1/4-18 NPT NEW 1903ZR Carbon Steel Thread Cutting
http://m.ebay.com/itm/111138306639?nav=WATCHING_ACTIVE

5 PCS 1/4"NPT Brass Internal Thread Socket Pipe Plug
http://m.ebay.com/itm/331330247205?nav=WATCHING_ACTIVE

Engine Coolant Water Bypass Gasket ACDelco GM Original Equipment 24505049
http://m.ebay.com/itm/121394743297?nav=WATCHING_ACTIVE

I don't think I'm missing anything, but if I am please let me know! I will also be posting pics of this project as I go.

Any suggestions are more then welcomed.

P.S. Don't buy anything from China on eBay unless you want to wait a month to get it........Lol!
 
Last edited:


Yes Bill I did that's when I decided to do this mod. By the way that's a great How-to thread.

I started this thread because as I'm doing these mods I want to post my progress with pics and I want to make Sure I'm doing everything correctly. You all can guide me, if I foul up.

I'm still a ROOKIE on the Gm 3800....lol
 
Going to do this when I swap to my Geb V. I'm wondering if the H bar is worth the effort of machining it out?
 


Wow, that thread was an interesting read! I don't think it helped with my decision but it was eye opening reading about their feud. I've never had a purchase go bad like that.
 
Lol....Yea that's what I thought also. That was a sour deal for that dude.

Are you going to put a intercooling system in your ride? I'm just curious!
 
Eventually yes. From what I read, the H beam removal only helps if you inter cool. I think I'll hold off until then. Thanks for the help!
 
So, I decided it would be best to get these items as well.

I got this respirator so I don't inhale aluminium particles as I'm doing the grinding and porting. If anyone is doing this, it is important to have one of these because metal shavings are really harmful, when inhaled. The choice is yours.
ec935f77b26f746b64a20bfc8679c485.jpg

fb4ee4239bfc9aacbac1a4dd277b95a6.jpg

b3f9c12bbc0924f3df52f613242703ba.jpg


I also purchased a 1/4" T-Handle Ratchet Tap Wrench, which I don't think it is necessary to get this job done, but I think it makes the job more professional.
e26bc05aa8343c9b8c6494581cf841a9.jpg

2e85313298e9f07d46d9a9450a8dd69c.jpg


Just my thoughts!
 


I have ratcheting tap handles. They are nice if you have a lot to do. Been hand tapping for 25 years but only had the ratcheting handles for 2.
 


On tapping. I think the ratcheting is overkill. You need to tap a little, remove and test your plugs. You want the plug to not be quite flush, then add sealant/teflon to it and flush it up.
 
You must log in or register to reply here.
Back
Top