It’s not economical to have a shop repair, the hours required are prohibitive. However OP says he can do the work and his buddy does a quality head job, sounds like OP’s plan is invest a couple weekends for his sister to save $3500 or so. If the tensioner tends to fail at 60k there’s gotta be an improved aftermarket model available or at least, 60k is a few more years of use either way - easy decision. I doubt pistons were shattered, might make a dent in the top but she’s not going for 1/4 mile drag times, just trying to get from A to B, a little inefficiency in the firing quality won’t matter here.
It’s not economical to have a shop repair, the hours required are prohibitive. However OP says he can do the work and his buddy does a quality head job, sounds like OP’s plan is invest a couple weekends for his sister to save $3500 or so. If the tensioner tends to fail at 60k there’s gotta be an improved aftermarket model available or at least, 60k is a few more years of use either way - easy decision. I doubt pistons were shattered, might make a dent in the top but she’s not going for 1/4 mile drag times, just trying to get from A to B, a little inefficiency in the firing quality won’t matter here.