I bought a Dorman replacement upper intake for my 95 Bonneville (VIN K). And have a few questions, first I have two stove pipes plus the one that was originally in the old upper intake when I took it off. One has a shoulder that fits good and snug in the lower intake but it would have a gap about 1/8" all the way around the hole in the upper intake. I read in one of your tech articles that there was a revision that is something like this and I wanted to check if I should use this instead of the original that is fits tight.

Another thing I was confused about was the PCV, the one that was in my Dorman kit has a hole in the top instead of a solid cap with a nut on top like the original I took off. Is this another type of revision I should make or is this for a later model and doesn't get used on a 95.

I had somebody on the board reply to another thread I had concerning this problem that I posted in it and was referred to this section instead. I was told that I should have drained the oil right away because the coolant eats up the bearings. I have no signs of coolant in the oil what so ever so I'm not worried about it. Not only is there no white on the dip stick, it is also not over fill. I drained the coolant too and it was nice with no oil in it.

Although I can't answer your questions specifically, please look into also doing your lower intake manifold gaskets while you have everything appart. It is something that should be done.

Use the smaller diameter stove pipe. It helps to protect the composite intake from the heat from the EGR stovepipe by allowing for an extra gap.

If your cap for the PCV didn't have a sensor in it, and was solid, use that one instead of the one that came with the Dorman kit.

What you can't see can hurt you. If you've had an UIM failure, the odds are very good that you have coolant in your oil. With the coolant/water being heavier than the oil, your lower bearings are sitting right in it. Don't want to spend the few extra bucks for an oil change, that'* your choice. Don't be surprised if a few months down the road you turn a bearing.

Yes, replace the upper and lower intake manifold gaskets and change out the oil. After that, wash the outside of the engine and rinse it thoroughly.