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Old 02-05-2008, 08:47 PM   #1
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Default What do you do when......

......you find you need a gasket that you can't find seperate, other than in a top-end gasket kit?

I like to replace these when I port and polish manifolds, and I do more than one at a time typically. This is for the LIM end cap, and seals the cap that is used to re-direct coolant flow throughout the LIM. They get dry and crusty, and the leaks cause the bolts to rust out. There'* no way I'll ship a LIM without pulling this, cleaning the surfaces, and sending it out in good shape. Besides, after I use all the abrasives, it'* nice to be able to clean out these passages, and it'* easier with the cap off:

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Step 1:
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Step 2:
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Results:
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10 mintues in CAD and file conversion to machine language. 5 minutes to cut each one (made several low-power passes to keep the cut clean). $9 in gasket material (enough to make about 20 of these).

John Wikoff gets a custom gasket installed, and another one riding along in the box for the future (he has another manifold or two). I have a FelPro to install, and a spare for myself, plus the saved file to make more any time.

This gasket material is vastly superior to the fiber OEM gasket. It'* a fiber/rubber composite.
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Old 02-05-2008, 08:51 PM   #2
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Showoff.




I've got a whole roll of that excellent gasket material...just no CAD program and laser to cut it.
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Old 02-05-2008, 08:52 PM   #3
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Says how thorough you are, my lazy arse would have just used GM gasket maker
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Old 02-05-2008, 08:53 PM   #4
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Only ZillaMotorsports supplies custom laser cut and engraved gaskets.

Now that'* customer service.
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Old 02-05-2008, 08:53 PM   #5
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I did this in about the same amount of time as it would take you, and I'll have no chance for leaks.

You can cut your own with an X-acto knife as well, if you have the original parts or the old gasket as a model.
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Old 02-05-2008, 08:55 PM   #6
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I've got the CAD

Thats so awesome Wren!
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Old 02-05-2008, 09:14 PM   #7
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How'* that corner line up with the parts?

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Old 02-05-2008, 10:07 PM   #8
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That corner was radiused to match the gasket about 30 seconds after the pic was taken.

The new gasket is a perfect fit compared to the OEM (Fel-Pro), and far better material for contact with coolant. I'll get some pics up later to show the fit.
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Old 02-06-2008, 01:11 AM   #9
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You choose.



FelPro:
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ZM:
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The choice is obvious. The new one has a rubber content for a better seal, and is more durable and rigid. It also covers the surfaces slightly better (I increased the rib widths by 0.050" all around).
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Old 02-06-2008, 01:15 AM   #10
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I must say, I'm very impressed. That'* some pretty fine work!
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