From what my indy told me special tools are not needed. The issue is with the harmonic balancer, there is a dowel pin and it must be lined up correctly. Also, there must be a way to hold the balancer in a locked position. I believe an extension wedged against the the cover or oil pan would suffice. Torque on the front crank bolt is high, 320 Nm for a 602, not sure what it would be on a 603. I haven't done the job myself, so I'm going by what he's told me. It looks like I'll be doing this job soon on at least one of my three 60x engines.

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Brian Toscano