Thread: Please help I am racking my brain on this one.

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Since I have had this leak I have gone through three sets of intake gaskets and each time they did not even come with the rubber china wall gaskets at all. They came with a small tube of black rtv silicone. It is hard for me to use silicone at all, I was always taught that if it has a gasket do not use silicone as that is what the gasket is for. And I have seen what using to much silicone can do to an engine especially when it is used to excess.

Originally Posted by aahx2011

They came with a small tube of black rtv silicone.

Use the Silicone Luke.

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Originally Posted by aahx2011

Since I have had this leak I have gone through three sets of intake gaskets and each time they did not even come with the rubber china wall gaskets at all. They came with a small tube of black rtv silicone. It is hard for me to use silicone at all, I was always taught that if it has a gasket do not use silicone as that is what the gasket is for. And I have seen what using to much silicone can do to an engine especially when it is used to excess.

Being a GM technician for too many years, I have to agree. Use the silicone. Not any silicone, but use the Ultra Black. Of the hundreds of intakes I have done on small blocks, I've only had one come back due to a oil leak. I always put a 1/4 inch bead down for the "China wall". Now are you sure it's the intake? Most blocks have a oil port in the rear along with the dist which can also leak. I have seen a few people forget to plug the oil port or not have the gasket on the dist.

On the few where the "China wall" fell into the block, GM released a Technical Bulliten years ago for how to keep that from happening. Basically you use a punch to create small indents to keep the "China wall" from falling in. I've only used that one time, and I really don't think it was needed. The customer asked for it.

350 intake valley 004.JPG350 intake valley 005.JPG350 intake valley 003.JPG350 intake valley 001.JPG

Originally Posted by autotec

Most blocks have a oil port in the rear along with the dist which can also leak. I have seen a few people forget to plug the oil port or not have the gasket on the dist.

I hope that it worked I tried to attach some pictures, the oil port I believe you are talking about is the one that I have my oil pressure gauge plugged into at this moment. Please let me know if we are on a different page on this as I have been known to miss an oil galley plug here and there.