Originally Posted by BSeriesTurbo

ls engines are the same jdm or usdm....but you could look on the wiring harness....or just simply look at the block stamp(on the bellhousing on exhaust side of engine halfway up block..)

It should say B18B if its jdm.
It would say B18B1 if its usdm..

or it could be B18A, A1 respectively if it it's older than 94