isnt it unobtaniam or something like that lol


-john

 

All jokes aside though, anything that can be machined can be drilled, plain and simple. Unless there is some surface treatment after the machining that would make it harder than anything we have to drill with, it is just not possible. But like I said before, it is much more likely that you "can't" drill it without messing up the coatings that he applies to his cranks.

Any of you knowledgeable machinists have any input? I'd love to be wrong about this.

 

Case hardening -Very hard to drill,easy to grind.

 

I agree with OldSStroker that you should be using a more ridgid aftermarket block. If you are experiancing block flex(which I don't see how you are not) then that can lead to crank failure, stronger block will extend crank life.

I agree with Eric@VRE that the Callies Dragonslayer would be fine for this application.

I have only had the pleasure of working with fewer than 10 HTC cranks, they are NICE pieces, as for drilling them, that should only be a problem in relation to the oil-shedding coating only in the area that you have heated and drlled through it.