I could not remove the harmonic balancer bolt. I had to borrow a big impact, my little craftsman 1/2" wouldn't budge it. I tried a breaker bar, no joy. I tried bumping it with the starter, distributor cap removed, 3 ft breaker wedged on, just spit off. Mac impact, 2 seconds. I also broke half of the little 8mm bolts with a 1/4" ratchet.