yea i kno that the d15b is a SOHC but the title for the motor didnt say DOHC, it said dual VTEC. im thinkin it might be some kind of wierd setup for 2 VTEC solenoids but all i can see dual vtec doin is makin vtec on all the time. but i dont know thats why im trying to see if anyone actually knows wat it is.