Originally posted by Jafro
but it's still a B18B1.
No, it's not. All 90-93 Integras use the B18A1 except for the GS-R, which had a B17A1. If you don't believe me, pop your hood and look.
If it does say B18B1, it is a replacement. Looking at the casting date would show that the block is newer then the car.