Code | Disp. | HP@RPM | TQ@RPM | CR | Bore | Stroke | Cams | VTEC | OBD | Production
B18A1 | 1834 | 130@6000 | 121@5000 | 9.2:1 | 81 | 89 | dohc | no | 0 | 1990-1991 Integra GS/RS/LS/LS-S
B18A1 | 1834 | 140@6300 | 121@5200 | 9.2:1 | 81 | 89 | dohc | no | 1 | 1992-1993 Integra GS/RS/LS/LS-S
B18B1 | 1834 | 142@6300 | 127@5200 | 9.2:1 | 81 | 89 | dohc | no | 1 | 1994-1995 Integra GS/LS/LS-S/RS/SE
B18B1 | 1834 | 142@6300 | 127@5200 | 9.2:1 | 81 | 89 | dohc | no | 2 | 1996-2000 Integra GS/LS/LS-S/RS/SE
All parts in the B18B1 are essentially the same as in the B18A1. Now, to get more technical. The B18B1 has more HP, and 6 LBS FT of TQ. I;ve heard that the B18B1 is a little more stout, but like I said they are essentially the same engine. LSVTEC (Eric) told me the only difference between the 90-91 B18A1 and 92-93 B18A1 was OBD systems, Intake and Exhuast Cams, along with the Exhaust manifold. Thus giving the OBD1 Equipped B18A1 from a 92-93 Integra 10 more HP and 6 more LBS/FT of TQ.
Im sorry for all the abreviations such as:
TQ=Torque
HP= Horsepower
LBS/FT=Pounds per Feet
Disp.=Displacement
Since a B18B would be a little more expensive than an A1, I say go with the A1 from an Integra.