[ogasman]

I have not heard of a problem with the valve seats mentioned by anyone before. I know they used to do most of the machine work on the heads by hand before, this may have been the problem with your heads. I think all the heads are now machined on a CNC machine, mine were. I think this is a fairly new change at their shop. The machine work on my heads is top notch, I am really not worried about it. I think it speak volumes that they stood behind thier products in a RACE application!! Most manufactures will not warranty any high performance products, and race applications void most warrenties.
As far as porosity, I visited the shop last summer, and they made it sound like they had only recently started doing the resin impregnation in house. He said when they first started doing it, they pressure tested first, then only used the resin on the heads that were porous. They must have had problems, because now they use the resin on all the heads and then pressure test them.
The tunnel port heads flow about 315 cfm at .700 in stock form. The high risers flow less. The high riser heads work much better if you fill the bottom 1/2 inch of the intake ports. You can take off 1/2 second in the quarter mile on a ten second car by doing this.

Paul