Jeff, as far as I can see,the oil passsage is a 3/16 hole next to the center right headbolt. the oil to the rockers doesn't go through the bolt threads but passes by in the oilway.No where near enough oil to lube the rockers could pass by bolt threads torqued to 90 ft lbs.If that was the case all the 235-261's would have non oiled valve gear.
