You could pinch it off. Lots of them were over the years. But the reason they were pinched off was because of diminishing oil feeding the the rockers. Worn rear cam bearing, worn engine bearings overall. Clogged passages, clogged feed line and passage in the head. It was a band aid. If all of your rockers are dribbling oil, not spitting all over creation, dribbling, particularly the rockers for no. 1 and 6, and the rocker adjuster ball and push rod cup look to be getting lubricated, and the valve tips and rocker arm tip also looks to be getting lubricated, then you are good to go. Too much flow and pressure, the oil spits past the rocker arms so that the adjuster balls and push rod cups get no or little lubricant, taking out the adjuster balls which are a big pain to find replacements for these days, and the oil spits past the valve tip and rocker arm tip, and the springs get no coolant. So resist the temptation to creat more pressure and flow if you already have what is needed and required.
