How to tell?

Can anyone tell me a sure way to tell the difference between a jdm b18c1 and a usdm b18c1? I ordered a jdm and think i might have gotten a usdm Thanks in advance

Theres no number after the B18c on the JDM one.

While a USDM one will have a number after the B18c. :)

Exactly. For example, the USDM Civic Si has the B16A2 while the JDM SiR is the B16A. All american made motors have a # after them.:D