Originally Posted by yoshoto 
Yes the material is porous andreas but it not pot metal, that is something totally different. Its chilled cast iron. I believe JWT used nissan blanks and in that case it would be chilled cast iron. Other than that it would be billet steel and its definitely not billet steel based on the pics and based on my own set of JWT S3R's.
ali86 have any of these shops actually seen the cam or the damage? it seems to me they think the cam is snapped in half or something like that.
repair to that material is possible if welded with the correct nickel rod, if you use anything else it can be welded but not machined. With the correct treatment of preheating and welding technique and cooldown there will be no warpage to the cam or stress points.
looks like the cam was dropped on the dowell pin end and this caused the pin to push out the bit at the back, pressure(trapped) or side force may have caused the crack along the side but all in all, if you put a new dowell hole at 180 to the original and do nothing else I cannot see that cam failing.
Wasn't it Charles Dundon that was having VE cams welded and reground? Have any of those cams warped or failed? It is the same material.
are you educated in the mechanics of materials? there is no way to every make this cam structurally sound again
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