the st170 is different from the blacktop block in the mondeo, unsure about the focus though.

As for the head bolts, the zetec ones are less likely to bugger the block like cossie ones do, hence there's no point having long studs, but i can see tims point. The zetec ones are tiny! Only m10 in size! I considered having some m12 ones made, but to be honest it would probably weaken the block.