The LNFs - built with the lost-foam cast block - had an issue with porosity and leaking/seeping coolant. The LDK, which is the European designation for the LNF as Brian pointed out, where built using sand-cast 'Gen 3' blocks, which have strength improvements and no leaks, but got PM rods rather than forged rods like the LNF motors. So building for HP north of 350 would require rods and pistons in the LDK.