Porting Manifold, Which Gasket?

[deflator]

I'm trying to port out my 2g manifold in the most efficient way possible. But I need to know which gasket would be the best to use, as in which would let me open the runners the most while still sealing really well.

I used the 4 layer composite last time, but that didn't even seal and I threw it away on accident.

 

[fwdmaster]

I used the oem copper 4 layer to port my manifold,I also port matched my head to match with this gasket

Street Tuned Motorsports.com - Rochester NY

 

[hypnoticpimp]

If your t28 is ported to match a 7cm gasket, than buy a 7cm ss gasket and port match the collector on your manifold...

For the runners,
"Port to match the stock 1G composite gasket (or 2g compostie gasket), NOT the new stainless one. Porting out to the stainless one is largely a waste of time, as you can't port the runners that large, and if you port the head to match the SS gasket also, you'll have a dead spot in the airflow due to the head flaring out, then the exhman flaring back in. If you don't have the stock composite gasket, it is less than 1/8" larger than the openings in the exhman runners, so you barely need to open it up. When I port them now, I only clean up any protrusions in the entrance, and leave it at that."

Visual Frequently Answered Questions - Home Page

 

[deflator]

Thats the part of the vfaq I was confused about. The one they are talking about is the 4 layer copper gasket?

I also have discovered a few large cracks in the divider inside the manifold. Is that anything to be concerned about?