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It looks as though I have a break in the intake manifold gasket on my port engine between the #3 and #5 cylinders (see the picture below). The engine seems to be running normally - not overheating, no apparent power loss, no loss of coolant. What is the best way to check that area for a vacuum leak?

From the pictures of the cylinder head that I can find online, it does not look like this area has any openings which need to be sealed. Is that a correct assumption?

http://www.ipernity.com/doc/307687/50410338

Thanks,

Peter

Are you sure it is leaking. You should have a rough running engine if you had a leak. My father used to shoot oil or something else into the area of a suspected leak. That would temporarily stop the leak and make the engine smooth out.

If its between 3 and 5 it's most likely the heat crossover. Most are blocked off at the gasket with a metal plate. Its purpose is exhaust heat under the intake to warm up intake charge quickly and to heat up the choke stove.

If that was intake port, you'd know it.
If anything it would leak exhaust.