Step by Step on 4.6 PI Head Swap
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i think it is the current 5.0 mustang mag has an article on the non-pi heads and the comparing of the non -pi heads to pi to the new 3v. turns out the non-pi are not that bad and respond wheel to porting. according to the article the intake is the problem. they took a pi intake made adaptors to make them fit the non-pi heads and picked up 30 hp. somthing to consider because the compression will be affected by installing the different heads.
in fully ported comparison the 2 are very comparible. the 3v blows them into the weeds.
in fully ported comparison the 2 are very comparible. the 3v blows them into the weeds.



