I bought this block to put into my Z but wouldn't mine finding the original car it goes to. If I do not find the car it belongs to I will use it. So if anyone knows this car let me know. Block casting date is B 17 9, I know this is early for a car with a 19N636736 SN. But that is what is stamped on the oil filter boss clear as day. Assembly date stamp is 412, I'm sure it has been decked at some point in its life as it has been bored 0.030.