LeSabre's Ported LIM Project - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-30-2008, 12:06 AM   #1
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Default LeSabre'* Ported LIM Project

After reading about the miraculous ported lower intake manifold, I decided to make one for the LeSabre. I ordered one off of Ebay that looked pretty good for $50 shipped. According to them, it came off a 99 Bonneville, mileage not stated. This looks to be in decent shape, with none of the pitting seen in some other LIM photos around here. And the casting looks to be pretty good to my fairly untrained eyes, again not like some other LIM photos around.

Opinions and advice appreciated. I've bookmarked about 6 threads that really get into the process and tools needed. I have the Dremel and carbide bit, and will pick up some sanding drums before starting. And a good set of calipers for measuring progress.

This is something I'm going to pick at in my spare time, since I still have lots of other stuff to do and want a nice project to pick up as I please.

Now for the photos of the LIM to be ported:

LIM top

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The front-side ports

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An example of the casting done on the manifold

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One of the runners. All of them are fairly lacking in carbon.

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That'* it for now. I will post progress with the porting and polishing as time permits, which isn't much currently.

Any advice and encouragement will be greatly appreciated!
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Old 04-30-2008, 12:16 AM   #2
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Thumb through this. It'* not a step-by-step guide, but it will 'show' you what you're after:
http://www.bonnevilleclub.com/forum/...ic.php?t=97624

More specifics here:

http://www.bonnevilleclub.com/forum/...ic.php?t=97754
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Old 04-30-2008, 12:32 AM   #3
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Thanks! Those are getting added to the bookmark collection of posts about porting the LIM.

And is it really necessary to open the motor while doing this? I see the reasoning behind it, yet feel sort of uncomfortable having the motor apart while working on porting out the LIM. I know, newbie/squeamish question.
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Old 04-30-2008, 12:40 AM   #4
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Take this as the bible:

The WIDTH and the HEIGHT of the ports is probably VERY close to where you want it at the WIDEST point. Halfway up the port for the width at the widest point, and the same for the long axis. Make sense?

Make the 3 corners that DON'T have the injector boss 'roundout' RECTANGULAR. You'll have a rectangle with a bulbout for the injector on each port. You'll be very close to a good port-match in size and port-port spacing as a result.

Leaving the motor open is no big deal if nothing gets in, and you'll do an oil change after the install (drive a couple miles first) anyway.
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Old 04-30-2008, 01:30 AM   #5
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Rectangular ports, round off the corners, and clean everything up. More material off at the edges than in the center to keep it straight.

Would removing material down to the start of the round injector area be part of this, or should I terminate a little ways above there to allow for error?

So a darn good straightedge and a scribing tool for marking where to cut up to are a couple more things to pick up before beginning this.
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Old 04-30-2008, 08:52 AM   #6
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Buy your new gaskets first. Test-fit them several times to make sure you're ok. LIGHTLY clean up around the injector bosses.

Then work your way up the runners from both ends shaving the rough. Knock the high points down to the low points.

It takes skill, manual dexterity, and alot of patience. Especially the first time you do it.

The inside radius of the 3 corners of an L36 port need to be the same inside radius as the cylinder head port when you're done. This last part can be done after you get the old LIM off if necessary. Or you can go by a picture of a cylinder head port for scale reference.
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Old 04-30-2008, 11:45 AM   #7
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Gaskets will be ordered shortly, and all the parts for the gasket replacement will be assembled. I'll definitely stop often to measure and check alignment with the gasket. No sense in falling too far off one side.

I was wondering what to do about the bosses, and that makes sense.

I'm anticipating putting a lot of time into this to ensure it'* as good as it can be. A nice little summer project.
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