Ok, I am new to the Honda scene but not knew to cars or mechanics, matter of fact I just swapped a 1.6L Vtec into my brothers Civic last week, but anyway, I am being a good board member and doing a search and found this thread.

History: Just bought a 95' Integra GS-R. The previous owner said he bought it as a GS-R but the previous owner said he had swapped a LS motor into it(dunno why). The car runs good and in fact is a GS-R per Title but is the only way to confirm that it has been swapped is to check for the B18C on the block or is there some other way?

Also, if it is a LS motor in a GS-R car, will the ECU or anything else affect this motor to not run as well?
Thanks
Jason