I've done some searches for this but can't find the right keywords to get the answer I need. I just bought a B18A longblock from a salvage yard that I'm planning to swap into my 89 CRX Si. The engine was marked as a 90 Integra but I want to be sure before I get too far into this. By just looking at the engine, how can you tell if it's a 90-91 or a 92-93? Put another way: The earlier models were obd0 and the latter were obd1. GREAT, what's the difference?