a good friend had his h23a1 pulled and installed a h22a. the guy that did it cant get it to start. What I do know is this..they swapped oil pump and put a new crank/tdc sensors in front of motor...they got spark, will start and run if spray in throttle body. noid lite test injectors very intermittent flashing. so it seems to me we got spark and timing is ok.. i am in process of removing a very poorly installed viper alarm(twisted wires and little bits of electrical tape) and getting the harness back to a more stock condition.