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GM 3.1L / 3.4L V6 Intake Manifold Gasket Set

This item is exactly what the doctor ordered for those of you who are suffering from the dreaded LIM gasket failure on GM cars equipped with the 3.1L or 3.4L V6 engine. It typically manifests itself as milky, antifreeze contaminated oil. The engine may be overheating as well. This is due to a physical breakdown of the existing OEM plastic and silicone gasket. It lacks the strength to deal with the expansion and contraction at the interface between the aluminum cylinder heads, aluminum intake manifold, and the cast iron engine block. This allows antifreeze from the cooling passages to leak internally, externally and/or sometimes both. Either way, this product will fix the problem permanently. It contains rubber coated steel PermaDry lower intake manifold gaskets. You can find an excellent how to on GM 3.1L / 3.4L LIM Gasket replacement here:

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This particular part number, MS98003T applies to newer 3.4L V6’s from 1999 onwards. For older 3.1L’s up to 1998, use MS98004T. Be sure that you use ONLY one of these two sets. There are other, cheaper sets that duplicate the original OEM gasket construction materials. They WILL fail in short order. From about mid 2003 onwards, these improved gaskets are installed as stock from the factory, replacing the old plastic ones. One tool that you may want to consider for this job can be found here on Amazon, Lisle Push Rod Remover 2.8L, 3.1L, 3.4L GM V6. It allows you to remove the pushrods without removing the rocker arms. It saves about 2 hours or so on the job. A video demonstration can be viewed here:

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Update (5/17/2012): This item is currently on sale here for the lowest price I’ve seen. I also found some auctions for this item here.

The featured review for this product, Fel-Pro MS98003T PermaDryPlus Gasket Misc., was written by BackYardMechanic.

The average rating for this item is 2.5 out of 5 stars, according to 2 reviews.