Hank, I have very thick skin and nothing you or anyone can say to me is going to change my blood pressure, this data "is what it is", if others want to throw stones at it, its their lose, not mine. Its a free education for many, and they should take notes, instead of fall asleep in class. Both the small chamber head and large chamber head have 1.94" valves, and where unshrouded at the same time with the same tooling for each head, and both also had lumps. Why do you think that just because the chamber is smaller it flows better. At low valve lifts such as these seen on street type engines like this, the chamber still shrouds the valves too much, even after unshrouding. Thats why in the full boogie race engines like Cotton's and others I have experience with, we had to run valve lifts that were almost 1.000" inch of lift, so the valve would open up past the point where the chamber had no effect on the flow, almost like there was no valve in it at all. On these heads here, even at .600" valve lift, the valves are still way down inside the chambers suffocating in a small chamber head. Now keep in mind, we are talking a stock, untouched chamber on each head, other than the fact they were unshrouded with the same tooling, the same amount at the same time of the valve jobs. You can naturally take a drum roll and roll the chamber back on the smaller chamber heads to dramatically improve the shrouding it has, but you don't totally eliminate it, like a large chamber has to begin with, plus you are opening the cc's back up as well, and defeating the purpose of why you are putting the smaller chamber head on to start with. A flowbench wont tell you these things if you don't have the correct size orifice, or if the head isn't placed on the orifice in the correct orientation just as the head fits on a 6 cylinder block. The basis for all this dyno testing is to do just what it is doing, and that is to confirm beliefs or reveal misconceptions that have always been held by a lot of people. This is the very first time that anyone can actually see a direct correlation between what CFM and HP actually means for these heads as well. Unfortunately, its going to bust a lot of peoples bubble about what they have believed for a long time, and not just on this small chamber vs. large chamber debate either. We have found so many other discrepencies that have long been believed, that are just completely wrong we could write a book....oh yeah, we are. But seriously, this should be looked at as a free learning curve to those that didn't contribute to this project, and take this data, and use it to further advance their knowledgebase and efforts, because flowbench data by itself is completely worthless, unless you can show what it means. And a dyno will translate that into real data you use to mean something....and thats what we have done.
