So I'm porting the head on my 2.5, and I have it porter to the point of it almost being flat and completely flush. Is it possible to make it completely flat and flush without going through the head or causing other problems? For an engine that makes 100hp bone stock, I want to get the most out of it I possibly can. It's been cleaned extremely, and I'm estimating a 50hp increase just from what's been done. In other words, without buying any aftermarket anything, I've boosted the hp from 100 to 150 with what came from the factory. So how much can be potted without wrecking it?