[whacka]

At what point would the motor need to be sleeved? If so what sleeves do people run?

 

[Pasta]

Honestly if you need sleeves replace motor. Whats your issues with motor.

 

[focusownerskid]

What engine do you have?

- Drew

 

[Ja-Red]

Duratec or zetec?

I'm assuming duratec since the zetec is an iron block.

Top speed has done 650 to the wheels on the 2.5 block with 2.3 crank for a hybrid 2.4l. Your biggest hurdle to surpass that is the head studs. I think the Mazda guys have some ARP L19 studs available. Set you back about $400.