[Oafus]

I have some data on those head used on my 427. I had fully ported low riser Ford heads on the car initially. A vavle sunk in each head, so I trashed them and put on the Edelbrock heads, as assebled from Edlebrock. I didn't have time to have any work done. On the chassis dyno I got an additional 30 hp. There were no other changes. About 6 months later I pulled the head and had them ported and the larger 427 valves installed. The gain was about 10 hp. The bottom line is that the heads are pretty good right out of the box. If you want to squeeze out the last little bit, you start to get diminishing returns.

Craig