Thread: SBC 350 Intake Gaskets Not Sealing

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Clean all of that mess off the block. Then with a fresh set of the recommended Fel Pro gaskets and modeling clay on the china walls, set the intake manifold back on. No need to bolt it down, you want to see what kind of impression is made at the China walls. That should tell you what you need to know and BTW, was the block decked?

Originally Posted by NTFDAY

Clean all of that mess off the block. Then with a fresh set of the recommended Fel Pro gaskets and modeling clay on the china walls, set the intake manifold back on. No need to bolt it down, you want to see what kind of impression is made at the China walls. That should tell you what you need to know and BTW, was the block decked?

That's a good idea with the modeling clay. I'm going to use a set of FelPro 1206 gaskets this time (as recommended).

The block has not been decked to my knowledge.

Originally Posted by amgnvan

That's a good idea with the modeling clay. I'm going to use a set of FelPro 1206 gaskets this time (as recommended).

The block has not been decked to my knowledge.

Ken's advice is solid. The only thing I'd add is to oil the china wall surface on the intake before you set it down on the clay, to compress the clay and then release clean. W/O oil the clay may stick and you won't get a good impression.