Re: High vs Low Valve Covers
The lifter has a recessed area about its circumference. This area is in the oil galley and has a hole to allow oil to enter inside the hyd lifter. The cup on top of the lifter, held in place by the circlip, has a hole in it. This hole supplies oil into the hollow pushrod and up the pushrod to the rocker arm. The rocker arm has cup the pushrod sits in, also has hole to allow oil to flow.
If the valve cover is short, the oil bounces off the cover top and dribbles/sprays onto the pivot ball to lube and flows down to the end of the arm and flows out over the end to cover the spring for cooling the spring and lube the junction of the rocker to valve stem.
If the cover is a tall one, more than likely, a dripper rail, shaped like an arc, redirects the oil from the top and drips it onto the rocker ball. Otherwise, no dripper, oil flows down the top and side and misses the pivot ball and valve stem, spring overheats.
The majority of us here know how much oil gets pumped to the upper end with the valve covers off. Adjusting a complete set of hyd lifters at idle rpm, less than 400-500 rpm, have pumped out a quart onto the fenderwells, frame, fenders, your shirt, face, hair, driveway, and anything else within 10 feet of the car.
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