X5 4.6is Engine Block from 4.4

[BRABUSBENZ21]

Originally Posted by kclow

My 4.6 block has developed 3 cracks behind one of the sleeve. I was advised by the machine shop that it will be risky to resleeve, and advised me to locate another block. However, finding a 4.6 block is tough. Has anyone managed to use a 4.4 block and rebored instead? Will it work? Thanks!

I just sleeved my 4.6is block with darton cast iron sleeves. I also had the sleeves diamond honed, and plated with a special chemical that makes the cylinder extra hard. So yes it is possible to resleeve your block. I also had the cylinders fitted with custom JE Forged Pistons. According to the guy at the Machine shop it is suppose be more reliable and have a higher compression vs factory. I should have my block back this week