One thing that has been thought to be the likely source of the power loss, is the closed chambers inability to breathe as efficiently as the open chamber head. Even though both heads had the intake valves unshrouded the same amount with the same tooling. It has been no secret in the Big Block Chevy world, that the open chamber version of this engine families cylinder heads are vastly superior in breathing, compared to its closed chambered brothers. This is perhaps the reason that many of the aftermarket cylinder head companies like Brodix, Dart and others only offer these heads in an open chamber design, even though a huge gain in compression is seen with the closed chamber. That isn't to say that a closed chamber style head can't still make some good HP and torque #'s. But when repeated dyno testing shows evidence that reveals actual data contrary to an age old belief that more is better, it should begin to be evident, that this old adage wasn't really true to begin with, and was just an assumption based on "more is better" type of thinking. There is going to be in the very near future, not only a magazine article or two revealing some of the dyno data from all this testing and the power potential of the 6 cylinder, but also at least(2)new "How To" books and power manuals that will be very complete, precise and accurate on how to prep and build your Six. They will also reveal a lot of never before told "trade secrets" and "tricks of the trade" specific to these engines, so there will be no misconceptions about what will or wont work, and hopefully further clearing up many other beliefs that aren't correct. I also have developed a flow system that will allow you to "see" the airflow of any given cylinder head to evaluate flow patterns in the ports and chambers to further reveal both cylinder and chamber shrouding that a flowbench won't tell you, just for these types of scenarios. Thats one of those things to be released in one of the books. There are also a lot of behind the scenes development taking place as well that hasn't been told yet, but will soon be very helpful to many members here. Stay tuned for the 250 dyno testing coming up at the beginning of the New Year....
