Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec not your normal 3.0 post

Assuming all that the cylinder liner is still covered by the head, I would expect that you would just have the disadvantage of having part of the force from the explosion directed down on the edge of the block as well as the overheating effect this would have on the edge of the block at the top. This overheating could cause the metal to be 'burnt' away much as a burnt valve does and would result in a damaged cylinder. It seems that wouldn't be a good option when you can get a 2.5l head and machine it larger for lower compression if you so desired. You could easily lower the 2.5L compression to 9:1 without any risk of damage with some careful machining. This would be exactly what I did with my 2.5L heads before I mounted them onto the 3L block. This would be ideal for the turbo guys if they really wanted to lower compression cheaply.

warmonger