Ok,I got a couple b18b's in some local junkyards but i know like a 96 teg b18b would be obd-2 if i am correct,but there is one out laying in a shed how would i know what obd it is? If i dont know what year it came out of?

 

Here's the basic info for USDM Honda engines:

OBD-0, 91 and older
OBD-1, 92 through 95
OBD-2, 96 and newer

 

but say if its on the ground stripped is there any way i can tell by the writing on the block?

 

b18a's are obd 0
b18b's are obd 1or 2
the obd 2's have the flat valve cover like the b20
(at least that is what i have seen, it may be just on 98 and newer b18b's)
and the obd 1's and 0's have the funny shaped ones

also the obd0's have pgm-fi on the intake mani.