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Is it possible to replace a rocker assembly from a 1954 235 with a set from 1959 through 1962 by just removing the 1/16" restrictor under the side cover. I am building 2 new 848 heads and would like to have better oiling to 1 and 6.

Thanks
Shady

In 59-62 the holes in the rockers do not line up with the holes in the shafts. They require more pressure to then weep out though the clearances. If you can get the oil passage to supply enough pressure, it should work. The 59-62 rocker shaft does not dump at the connector in the middle, thus pressurizing the rocker shaft and ensuring all the rockers get oil to the weep holes.

I was thinking about changing the entire shaft and rocker system complete from 59? I am sure someone has tried this over the years. Just asking as I don’t need an expensive mistake.

Shady

Shade Baby - Here's a recent thread that discuss a lot about the rocker shafts and differences in oiling paths for the 235 heads depending on year of manufacture.

Lots of reading, including the links provided, that should offer you some info to help understand what's going on and possibly give you some insight on the rocker assembly swap your considering.

Thanks for all the help, I will rebuild the 1954 rocker assembly, and make sure everything is clean.

Shade Baby

If you find you need new rocker shafts, I'd suggest you go with this set (pair) of ME242 Rocker Shafts from Jim Carter.

His price is the best by far that I found! They are what I bought recently to replace my worn out shafts on my 261 being rebuilt.

Rocker shafts only wear on the bottom. It's possible to turn them upside down, drill new oil holes, and plug the ones on top with brass dowels to correct the oil flow. Use a solid carbide drill bit, as the shafts are hardened all the way through.
Jerry