Well, the LV/VK 30 and VK 40 all have the exhaust port at the bottom - not sure about the LKV 40 [haven't been able to find a pic of one]. Is this one opposite? If so, then it's quite possible it's a US model.
The VK 30 bore spec from the manuals I have is 2.3125", or 2-5/16", FWIW.
Cheers, Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
