What is the fair market value of a B18C1? I have a GS-R with the above engine. I'm wondering how much I could sell it for. As an option to rebuilding I could just buy a less used JDM engine. I have no idea how much the existing engine would offset this cost however. The vehical has almost 191k miles on it. Being that I am the third owner I have to assume that the engine does as well. As for maintenance history, like I said, I'm the third owner.