this weekend, i put around 12 tanks through my sirio at the track, runnin real rich, so i got around 17 tanks on the engine total, and this thing still grinds at TDC and it still seizes!! man, this thing is gonna take forever to break-in...i'm just surprised, i mean, ususally after 10 tanks through another engine, its broken in, but this sirio kanai is the tighest engine i've ever broken in, and it still isn't even!