I am putting together a 540 for next season. I have the short block done, the cylinder heads finally showed up from A.F.R. I am in the process of getting the correct valve springs and push rods. The next step will be the intake. I looking to run between 5000-5500 rpm. It should be making about 650-675 h.p. ( at least thats what my desktop dyno says)
I have talked to Dart and Brodix. They both seem to recommend their oval port manifold. I have heard of this trick some time ago, but don't know of anyone who has tried it, let alone someone with real dyno numbers to back up their claims. I understand the benefits of increasing the velocity of the intake by squeezing the intake runner down a bit with the oval ports. Also, I realize that at 5500 rpm , the oval manifold will still be able to flow enough to keep up with the demands of the motor. I know about the increase in torque that this would net. But do I really need it? I don't want to lose any top end power. After all, who cares how fast we can go at 3000 rpm, I want to get as much power as possible at 5500 rpm.
What bothers me is that it just doesn't seem right. With the motors I have built over the years, I have spent a large amount time making sure that the intake and head ports match up as perfectly as possible. Now, I am being told to drop a smaller intake port on these heads.
Does anyone have any experience with this? Any real dyno numbers??