Small block adj. rockers

My 2 cents.............

I do not believe that banana grove shafts cam on any 273's from the factory.......I've torn down 64-5-6 273's that were unmolested originals and never found a banana grove shaft.

I believe, they may have come from the factory on the 340 T/A engines, can't say with certainty, never torn down an unmolested T/A engine; the bare shafts were/are available over the parts counter at the dealership.

The shafts are hard (in comparison to non banana shafts) and the groove are for better oil distribution and better wear characteristics when working with higher spring pressures.

There may be differing opinions..................