[straycat]

Friend installed new cam and lifters in motor he's building. 421 with SD980 heads. Installed a new RA4 cam w/Rhoads lifters. He used break in lube and oil. After start up he noticed 4 push rods on cylinders 1-3-5-7 not turning. Upon looking at the base of those 4 lifters the wear pattern showed they are not turning/spinning. The lifters move freely in their bores, then swapped non turning lifter with one turning and same result. Tried different cam and lifters and same result. The push rods turn freely plenty of clearance with guide plates. He doesn't want to run the motor this way with the fear of ruining the cam. Any suggestions why these 4 don't turn.