new lazy lifter....

Jadaharabi said
Not all 273s with adjustable rockers had the banana groves from the factory.

Non racers may not know this but.

One of the reasons for adjustable rockers on a hydraulic cam is to adjust for a zero lash to beat lifter pump up.

Ya, no racer here. Does make sense. Custom push rods could do the same I suppose. I wonder if the ratio is more consistent between the two. My take was less flex in the rocker.