<VV> Tech question--pilot bushings

[BobHelt at aol.com]

I have been rebuilding engines and replacing clutches for years. But each  
time I removed the old pilot bushing and installed a new one , I did so without  
actually INSPECTING the new  bushing. 
 
But this time I did, and got a surprise. The NOS GM bushing looks to be  made 
of solid bronze. The surface under a 20X loupe looks to have some  
inperfections, BUT it sure is NOT made of sintered bronze as I understand  sintering. 
Sintering as I understand it, is the forcing of small balls of a  material to 
adhere together comprising a structure or object. This has no small  balls of 
material. And it is not porous either.
 
Several other NOS bushings are the same. It would look like it's nearly  
impossible to force oil thru the bushing as has been described by others as a  
method of oiling it. Also just soaking the bushing in oil will provide good  
lubrication, but I can't see how the oil could posibly penetrate the  bushing 
proper.
 
What are the experiences of others? Does anyone have any bushings to check  
out and compare with mine? Any thoughts or comments? 
 
Regards,
Bob Helt