The Toyota 3-TC is a 89 mm bore , the 3.0 Duratec is 89.4 mm ,so a + 1 mm slug would fit with a gentle overbore of the 3.0 block.
The big question is the height and the pin diameter. Getting a forged , lower compression piston for the Duratec would open the door for forced induction.
my 2c
flacoman
