Here's some info I posted a good while back
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I have just had a look on my engine ( I used the original Zetec bolts )
They are M10 X 40mm set bolts ( Fully threaded bolts ) standard metric thread.
One difference over a standard M10 set bolt is that the head size is reduced to take a 13mm spanner .... I believe there is still enough room for a 17mm standard hex head though
If memory serves me right, 6 bolts will do the trick.
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They will be the same on the CVH Engine