The LS engine is the least expensive way to break into the more performance-oriented b-series engine family. The b18a1 was produced from 1990 and 1991 in an obd0 model and 1992 to 1993 in obd1, then the b18b1 was produced from 1994 to 2001 as an obd2 engine. All models were available on the USDM market, and continue to be readily available in salvage yards. Any Acura Integra RS, LS, or GS will come equipped with an LS motor in one form or another.
The LS gained its name for being the only b-series engine to come without vtec from the factory, but LS/VTEC hybrids have enjoyed some popularity since their inception. With a little bit of work, a VTEC b16 or b18 head can be fitted onto a non-VTEC LS head.
Installing an LS motor into a Civic/CRX engine bay is the simplest of b-series swaps, as it requires minimal wiring modifications (especially if using an obd0 model). My full b18a1 writeup is also available on this site. After installation is complete, inexpensive modifications can be made to greatly improve their performance. Simply rechipping the ECU and replacing the camshafts, cam springs, lifters, and guides will completely revitalize the powertrain of a 30-year-old Econobox.
