My cam peaks power around 6500-6600 or so.

ZZP used stock rods when reving to high 6000s (maybe even into the 7000s) on their twin turbo drag car before they went to their built block and the single turbo. Apparently never had any major failures on a stock block... just head gaskets and other crap.

Never heard of stock pushrods giving out above certain RPMs either.