ones a copy of the zetec e production block and the others the real wrc block fitted with niksil liners ,all parts like crank sensor brackets machined off , and you have to use a plate on top of the block as the liners sit abovethe block face , tbh i wouldnt even consider one of these unless youve got deep pockets, just gofor the £750 cgi zetec e block as its a straight swap.
can i ask what bhp your after?

cheers paul