Perfect. So that means it should be a LHU. The LNF from our donor is a foam cast, looks like it got hot and stuck to the packing foam that it was shipped in. From the studies I've done, that's consistent with all LNF's. The LDK was then built with higher compression and a few mods, but still foam cast. They then built the LDK as a stronger sandcast block and built itwith e85 compatable seals and called it LHU. It also has a slightly shorter cam, intake I believe. I believe that since the block Tim got from ATK is sandcast, not foam, it's a LHU, higher compression e85 comparable 2.0L Ecotec.