Darby,
This is what T-rex's instructions state. I'll scan them if you want. Let me know.
I can tell you that 72 ftlb would be too much for such a bolt, in theory. The rear wheel axle of the Busa requires 72.5 ftlb. It is large (36mm nut). The Kawi KLR 650 has a plain rod type axle (as opposed to tube type axle of the Busa - different torque rating for same diameter, tube vs rod). The KLR nut is 21mm I think, or may be 24mm. The torque rating is 69ftlb.
Whether you damaged something is hard to know, but see my conclusion below. The bolt is made from high tensile steel, while the engine block is aluminum.
I design ignition system parts for industrial engines for a living. This is what happens when an industrial spark plug is over-torqued (a plug body is a tube not a rod. I have seen people torque spark plugs at torque values designed for rods, not tubes): the tube is stretched into the plastic zone. Internal seals which are crimped onto the ceramic inside, are stretched as well, and can seal no more. Now there is gap between the ceramic core and the seals. The cast iron head, the female threads, is rarely damaged, because the latter are harder, but also, and this is key, because the engine head diffuses the stress throughout a large volume.
In the case of the engine block, I can only speculate. The aluminum is softer than the bolt which is hardened steel, but the stress (stress lines) created by loading the bolt is diffused throughout a large volume as well. The block is a large mass. The bolt should suffer but the material is much harder, so it probably stretched little, so it is Goliath against Goliath in this case. My conclusion is that the female thread in the block should be OK.
To be sure, try to find a go-no go gauge to borrow in order to be make sure that the # of TPI, whatever it is for a M36, are within specs. If not, the gauge will not engage fully. DO NOT USE A TAP!!!! Also a visual inspection must be performed; if no cracks are visible with a jewel's loupe (a couple bucks at Harbor Freight), you can be assured that no damage was done.
If the thread is damaged, but no cracks are present, you might be able to machine an oversize thread in there (I am sure there is enough meat in the head). If cracks are present, this is could be a critical issue as they could spread over time.