Block:
LS B18A1
OK i forgot to drill a place for a knock sensor when i had the motor out if there another spot i can put it??

 

Honda put it between cyl 2 and 3 for good reason. There is no other good spot to put it in relation to the cyliders, where it should be.

Tap and install the KS in the blank on the back side of the block

Sucks you installed the motor already