Re: Duratec 25
you mean the old f-series petrol engines and the r-series diesels are the same.... the L series is an evolution of this engine, so not the same.
"Blocks should be exactly the same in the petrol engines."
sorry this statement was a little vague. i meant the 2.5L ford and Mazda blocks specifically.
but all the 2.0 2.3 and 2.5 blocks should look the same on the outside, so if you going to get a mazda block, then the only way someone could say it was a Mazda block is if they traced the engine number back to the donor vehicle.
having said that, my duratec 2L has 2.0 cast on the outside of it, so it might cause questions if you are making a 2.5 into a 2.4.