Is this done with a dye grinder??should I lay the grinder flat against the hole with a sanding roll??
I gotta get this thing together!!
Thanks again
hulk

Yes, a stone with a rounded tip, just slightly bigger than the holes. Make sure you have a good stable secure hold and just touch them lightly the length of the hole. You don't need to make "rounded" chamfers, just lower the oil holes so the edges are never able to scrape the bearing. I'm suprised the crank didn't come with the oil holes chamfered. A guy at work tore up some big block chev bearings becuase his oil holes weren't chamfered. Just a touch on the sides and a tiny bit more on the ends.

Don't use a sanding roll or "lay it flat". Just touch them at a 45 degree angle or so like your drawing with a pen.

If you do too much you'll reduce bearing surface on the sides and while not a big problem this is a case of "less is more". If you have an old crank laying around try it first to get the feel but it really isn't that hard.

Wash hell out of it when you're done and run brushes thru all the passages. You sure don't need any metal filings or stone grit in your new engine!

Thanks guys,as a matter of fact I do have an old crank here..Ill practice first...
Hulk

Hulk this is definitely not my area of expertise, but at least I can pass along some words from some guys smarter than me:

"The oil holes on each journal should receive a very slight chamfer; nothing big, just chamfer the edges approximately .030 to .060 inch. Don't grind a giant trough around the hole. All you are doing is reducing loan carrying surface and wasting your time" - John Baechtel from the book Small Block Chevy Performance

"It is also popular to flare the oil ports on the rod journals. This is I guess an effort to increase the oil supply to the journal, but I think it is a waste of time. If the timing is right [referring to oil hole location here not ignition timing] and the bearings are properly installed, the journal will get plenty of oil. The edge of the ports should be deburred, but there is no need to enlarge the opening" - Smokey Yunick from the book Power Secrets

as mentioned,,, a small .030 chamfer is fine. don't forget to get the sharp edge of flared over metal from the inner edges of the chamfer. i use the oil hole cleaning brush to drag the inner corners using the metal sides of the wound metal brush handle till it rounds them off. don't forget to polish the journals AFTER chamfering. it creates a small puddle area arround the oil hole to allow spreading/distribution widthwise on the journal.
andy