I bought a b18a a while back and i was told that it was a 92 when i bought it...that means that its obd1. Well i was looking at my ecu today and i noticed that it was a pr4 ecu...which to my knowledge is a non obd ecu. My question is how can you tell the difference between the 90-91 LS and the 92-93 LS motors? Im thinking that he might have mixed and matched parts because i have pr3 cam gears(luckily they are the same as the pr4) and i have a 92-93 tranny but there was a clutch on the engine that was from another tranny. Is there any way to tell thedifference between these two engines...i really need to find out which one i have so that i can do the wiring accordingly. Thanks

Sean

 

look on the right side of the ehead (if you're looking at it from the front) it'll have a year on it

 

Thanks alot dude...ill do that later today.

Sean