i got a 94 cx hatchback, i took off a bad head, the two valves per cylinder one and got a 4 valve one off a 94 car as well, now the freaking thing wont start.. i got spark and i got fuel pressure and my ecu isgrounding out the injectors, it sounds like a timing problem, but hell its only a sohc and it was spot on. i quadruple checked my wires and they are good, 1 3 4 2. anyone ever swapped heads like this, is there something ive overlooked???