when you get a chance.. pop your hood and look where the valve cover and the block meetyou're gonna see 3 circles, each with 2 numbers separated with a /each set of numbers in the circle represents a year, month, and day in which the motor was manufactured. i.e. if it was from a car made in june of 1994 it'll have (4/9) (6/0) and so forthif it just says B18b that means that the motor was imported from JapanUSDM acura/honda swaps end their engine codes with numbers (B18A1, B18B1)JDM ends their engine codes with letters (B18A, B16A, B18B)