Plastic or Aluminum - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-17-2006, 12:27 AM   #1
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Default Plastic or Aluminum

Alright, the Bonneville is ripped to pieces because I'm replacing the UIM and LIM gaskets and the such along with a bunch of other goodies. I went to the GM dealer and they brought out two sets of LIM gaskets.

Aluminum and Plastic.

I had plastic originally and I would definitely go with the aluminum if I can.

The GM guys had no idea the difference besides being metal and plastic.

Im going to bring mine over tomorrow and figure out which matches.

Any Clues from anyone if I can use either or, or?

Did they replace the gaskets with aluminum in 98?

Thanks for all of the help!
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Old 05-17-2006, 12:36 AM   #2
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Several here have used the aluminum gaskets, and they seem to fit all Series II 3800s.

I just ordered a set. Given the PITA they are to replace, a few extra bucks is money well spent.

Here'* a link to a recent thread posted here:

http://tinyurl.com/qn759
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Old 05-17-2006, 02:02 AM   #3
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Just did a second car with the new aluminum gasket. Much better....get tnat one, you won't regret it.
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Old 05-17-2006, 10:21 AM   #4
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My local dealer doesn't stock the plastic anymore. GM is superceding the plastic with aluminum.

The plastic is old stock...take the aluminum only.
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Old 05-17-2006, 01:51 PM   #5
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I went and looked at the two gaskets again today.

The metal ones have a different rubber gasket design( the two on the ends)

as the plastic ones have identical ones to mine...

I just dont want to buy the metal ones and have them just to look at..

anyone know where Im coming from and any suggestions?

I definitely want to go metal!

Alrighty, I did more searching around this awesome site and I came across the goods i needed...

The aluminum with pins CAN work on mine, just wondering who has done this and if any problems resulted. THANKS SO MUCH.
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Old 05-17-2006, 04:22 PM   #6
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I've done two of them, others have done them...

Probably at least 10-15 on this club. Not a single person has experienced any issues or problems. Do it with confidence.
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