I use them EDM lifters as I have one of Dwayne's cams and he supplied the lifters and nitrided my flat tappet cam. I just use the stock rocker shaft oiling as the solid pushrod blocks the hole in the lifter. I have been running my eng like that since 2011 and it carries good oil pressure as it runs around 50 to 60 psi warmed up cruising along and about 40 at idle in gear. I use these Hughes roller tip rockers. Ron