d15b block identification

[QWK D15]

I have an engine with an I.D. D15B(no number), but I had to take out an oil restrictor to run the Y8 head I put on it. Its turboed now and I want to do a mild engine build. My question is, how can I determine if this block is JDM or USDM to figure out which rods I currently have. I received the motor rebuilt with a rebuilt DX head on it, and have no history on it. So I dont know if someone put the oil restrictor in or what. Is there a magic number hidden somewhere, or an extra tab hangin off the side of the block or somethin crazy like that... how can I identify this thing???

[allmotorX]

d15b is jdm vtec motor. The person you got it from had to have swap the head on it

[Scotsman]

no number means jdm , i am pretty sure of that

[MidLifeCrisis]

d15b is jdm vtec motor. The person you got it from had to have swap the head on it

if the block has just d15b stamped on it, it can be either a JDM D15B non vtec or a JDM d15b vtec motor, no saying which it is..

[allmotorX]

if the block has just d15b stamped on it, it can be either a JDM D15B non vtec or a JDM d15b vtec motor, no saying which it is..

thanks i didnt know d15b was non vtec also