On my bigblock solid flat tappet cam I got from Dwayne Porter he gave me the Comp EDM lifters which have the small hole in the bottom for lube on the cam lobe but they also have the hole in the top so if I wanted to use hollow pushrods it would oil that way. But I just use solid pushrods that block the top lifter hole and oil my shaft and rockers through the stock oiling system that comes up through one of the rocker shaft bolt holes. Ron