The Stovebolt Site Forums The Shop Area Engine Shop ’59 235 Rocker Arm Shaft

I bought a set of used rockers off of fleaBay for my ‘59 235 and the shafts are excessively worn. I see that I can buy replacement shafts but I haven’t seen any where they list different years. Are the shafts from a ‘59 the same shaft as previous models or are the holes in the shaft aligned with the offset groove in the rocker?

Rocker Arm Shafts are the same for 1940 to 1962 Chevy 6 cylinder engines .

GM # 0.353 - GM # 3836138

There are two rocker shafts on ebay .

Go to ebay & in the search box type.............3836138

Llewellyn GM Obsolete
Northridge , CA.
phone : 818 - 363 - 5094

Llewellyn has ( 1 ) GM NOS rocker shaft in stock

Here's a PIC of NOS rocker shafts that I purchased back in 2007 .

https://i.postimg.cc/rFftcj5C/Rocker-Shafts.jpg

These are getting scarce in GM NOS .

PIC

https://i.postimg.cc/fWgQMjGc/235-Chevy-Rocker-Shafts-GMNOS.jpg


George
'54 3600

Here is a rocker arm rebuilding service that may be helpful. http://www.rockerarms.com/pages/gm.html

I have used them for rocker arm rebuilding and they are excellent. Not inexpensive but when they are done with them, they are right on the money. No wobbling, oil leakage, nice new adjusters.

Thanks for all the suggestions. The rockers seems to be in good shape so all I want to replace is the shafts. My concern was the shafts being all the same thru the years. I checked the existing shaft and the holes in the shaft don’t align with the offset grooves in the rockers, so I want to make sure that is correct of a ‘59 235 before I invest more money into the assembly.

The 1959-62 rocker grooves will not line up with the holes in the shafts.
This is the way Chevrolet restricted the flow.

Thank’s that is the answer I was looking for!

It’s not that the rockers are in good shape, is the clearance between the shaft and the rocker. It’s important on the 59-62 version because if it’s a little out of specification, the oil pressure bleeds off around the rocker and because the 59-62 rocker has the off set groove, if the pressure is bleeding off around the rocker then the rocker does not get sufficient oil. Just check it carefully.

I’ll have to check the clearances but when I removed the rockers from the shaft, every place the shaft wasn’t worn, it tightened up nicely. Do you know what the clearances should be?

I have a set of new shafts and rockers under the bench, when I go out there today I'll try and run some clearances

The rocker arms are much harder than the shafts. It sounds like yours will be fine with new shafts. Been there, done that. They were out of t-shirts.
Carl