273 rocker arm adjustment

69_340_GTS said

You don't need any extra holes or banana grooves. If it were a race car, maybe.

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I am suspect it depends on a combination of lift, spring pressure and RPM's. Get any one of them over a certain level, and it'll need it. Without the 2nd holes, the only oil to the pushrod cups is from vapor and maybe a bit that dribbles out of the top hole. Not good enough for performance use IMHO.

The OP has already explained that one of the cups is turning brown from heat... the 'why' is certainly lack of adequate oiling. Plus the galling on shafts and inside rockers says a lot.

And it sure does not hurt; I simply cannot see why not do it.

2nd holes on my shafts are 75-80 degrees around the circumference, straight above the bottom hole on the pushrod side. Diameter is .125" (1/8').