Bottom line is, several dozen of our CNC'd stealth heads have been dyno'd on 500+ CI engines. They make in the area of 675-725 horsepower everytime like clockwork.
CNCed ? .. how about the-best OOTB ??
And what would your grocery-list on that motor be?
For the motors we are talking about, we are talking 500+ cubes, a cam at least .565+ lift, usually pump gas (10 to 10.5:1 compression - a few of the engines have been 12 or 13 to 1), roller rockers, 950-1050 carb, etc. Obviously, components must be matched correctly, and the engine must be tuned correctly, but there's no magic to it.
Out of the box, (non CNC version) most guys are making 540-560 HP with similar internal components as described above.
If you take the well known formula of CFM x .257 x number of cylinders, these horsepower numbers quoted are within the range of this formula, based on the CFM numbers we publish for our heads. This stuff is not rocket science and there's no mysteries to it, it's pretty simple and straightforward.
