Are you guy's putting a small amount of grease on where the TOB slides before you put it together ?
I have always done that.
Same where the input shafts rides in the pilot bearing.
203,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here