It's a tough situation because Subaru won't let anyone know what has or hasn't changed and when. We have 704 blocks built over 700 whp and we've had 3 failures at 550-600 whp. We reinforced a block and the problem magically goes away?
You will never know if your older 704 block is good or not until it's too late. If Subaru fixes what I believe is a problem, we'll never know because we won't take that chance with our customer motors
I can tell you with the number of calls I'm getting about these block failures, some in their 3rd block, it's far more widespread and issue than is being posted about. Now the fact they are breaking under 400whp has to do with using the oem ecu and letting too much detonation through which massively spikes cylinder pressure so it might as well be 600 hp.