ok so basiclly i got a PMR=b16 head w/ b18c block an type r internals. I got it some what built an when we set the timeing an we turn the motor over with a wrench after about a turn an a half the intake side cam will jump a tooth on the timing belt. its the gsr timing belt and nothing in the motor is locking up because without the belt on everything spins freely. also if we rotate the motor in the opposite direction it does the same thing on the exhaust side cam...............PLEASE HELP!!!!!!!!!!!!!!!!!!