Meticulous Mouse For The Mule
Another step in maintaining oil control is preventing the oil from pooling in the valve cover (which keeps it from being sucked out the breathers). To do this, Urban recommends threading the two feed holes to the lifter oil gallery and installing these .060-inch restrictors. The center hole is the feed from the oil pump. The only risk in doing this is running the valvesprings short of lubricating and cooling oil, but I'm running special valve covers from Billet Fabrication that spray a light mist of oil directly on the valvesprings, so there are no worries. These were developed in NASCAR and are used on all forms of racing machines now. By the way, I chose to not run one of these restrictors in my PHR 427 stroker--which's why it blew up at Sebring in the One Lap! I learned my lesson there....
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