boost affect on in.man. gasket?

[isnms]

What affect does boost have on the intake manifold gasket ( IMG here after )?

I found a hole in the IMG between 1&2. I took it back to the machinist who did the rebuild. Good machinist and had no problem replacing it under warranty. He asked me if I was running a lot of boost. I try to keep it at 11psi and under since it hits fuel cut at ~12 or above depending conditions. He said that the IMG was "accordioned" out.?. He said that he could see the impression where it had been seated. I haven't seen the gasket, and probably won't get to, so I don't know exactly what he was talking about.

What could cause the IMG to accordioned out?

 

[GrimJack]

Is he talking about boost pressure pushing the gasket out from between the two mating surfaces? Are you running stock Toyota gaskets? I didn't think this was possible, at least not with the stock gaskets, they are pretty solid...

 

[isnms]

That is what I gather from his description. I only saw the hole between 1&2, from the outside. A smoke test revealed that and no other leaks at all.
I don't know about it being Toyota gaskets. Not sure what kit he got to do the rebuild.

 

[IJ.]

A big backfire can pop a gasket as you're talking a couple of 100 psi when it happens but under normal boost no way if everything is flat and torqued to spec.

 

[isnms]

Thanks IJ