RE: 3v heads for 4.6 mod motor
I announced this, at the very least, over a year ago. I had been offered a position to help set-up the new line, and saw the first few sets of heads. Was told they would be in the F-150 first, and then the Mustang. Was told it was all about cost....but that they did make better power(obviously)and were more efficient than the 2 valve head.