Why don't we advise or use the stock 8.1L 496 forged rods with their big oversize diameter pins?? When you get a chance take one of these rods and put it down on a table and compare it to just the stock GM 502 or old dimple rods with 7/16" rod bolts. After a quick visual you will see the 8.1L 496 rod is way smaller in the beam just above the crank end journal and the bolts are only 10MM and not a very strong 10mm at that. That's why we use our special H-beam billet rods with the replacement forged pistons we sell.
You can use the stock rods with forged (heavier) pistons and when they part company, don't say I did not mention the differences.

Best Regards,
Ray @ Raylar