These pre-owned units have been taken out of cars in the UK and are tested here for compression, oil pressure and blow-by. The assembly includes everything from cylinder head to clutch and transmission. These units are ready to bolt in. Some minor mods might be needed depending on your exact configuration. They'll be pretty grubby too, plan on spending some effort cleaning them up first. Note that while we guarantee that the unit works initially, we cannot guarantee longevity. We also recommend that you check all seals for leaks, etc.