I'm thinking about different options in a 92 Civic CX.. (obd1) I'd like to stick with the d series if possible. I have a spare d16a6 on hand. The rings in it are shot, but I could easily rebuild that motor because it is just sitting in the shop. I'd also like to keep my car OBD1. My questions are: Is it difficult to change the d16a6 to obd1? I'd also like to swap the head with a vtec head, looking at a z6 so I don't have to deal with changing the y8 to OBD1. And I'm also possibly going to go with a small turbo. Nothing more than 10psi for certain. Another question is: Should I just put a z6 head on my d15 that is currently in the car, or would it be better to build the d16 block? When dealing with motors this small, I'd assume that every little bit of displacement helps, And I can't immagine the cx motor being tough enough to handle boost.