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#1338980 Tue Dec 24 2019 04:03 PM
Joined: Feb 2019
Posts: 2,647
P
Phak1 Offline OP
AD Addict
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?


Attached Images
Last edited by Phak1; Tue Dec 24 2019 04:03 PM.

Phil
Moderator, The Engine Shop & Interiors

1952 Chevrolet 3100
Project Journals
Stovebolt Gallery

‘59 235 w/hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Phak1 #1338998 Tue Dec 24 2019 06:17 PM
Joined: Jul 2007
Posts: 530
'
Shop Shark
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

Last edited by '54 3600; Fri Dec 27 2019 02:35 AM. Reason: add

1954 3600
Phak1 #1339076 Wed Dec 25 2019 02:40 AM
Joined: Aug 2001
Posts: 1,283
G
'Bolter
Here is a rocker arm rebuilding service that may be helpful. http://www.rockerarms.com/pages/gm.html

Phak1 #1339083 Wed Dec 25 2019 04:47 AM
Joined: Dec 2017
Posts: 1,142
D
'Bolter
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.


Mike
Phak1 #1339094 Wed Dec 25 2019 12:28 PM
Joined: Feb 2019
Posts: 2,647
P
Phak1 Offline OP
AD Addict
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.

Last edited by Phak1; Wed Dec 25 2019 12:28 PM.

Phil
Moderator, The Engine Shop & Interiors

1952 Chevrolet 3100
Project Journals
Stovebolt Gallery

‘59 235 w/hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Phak1 #1339112 Wed Dec 25 2019 02:52 PM
Joined: Jan 2001
Posts: 5,223
P
'Bolter
The 1959-62 rocker grooves will not line up with the holes in the shafts.
This is the way Chevrolet restricted the flow.


See the USA in your vintage Chevrolet!
My Blog [chev235guy.blogspot.com]
Phak1 #1339113 Wed Dec 25 2019 02:55 PM
Joined: Feb 2019
Posts: 2,647
P
Phak1 Offline OP
AD Addict
Thank’s that is the answer I was looking for!


Phil
Moderator, The Engine Shop & Interiors

1952 Chevrolet 3100
Project Journals
Stovebolt Gallery

‘59 235 w/hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Phak1 #1339131 Wed Dec 25 2019 07:03 PM
Joined: Dec 2017
Posts: 1,142
D
'Bolter
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.


Mike
Phak1 #1339183 Thu Dec 26 2019 03:36 PM
Joined: Feb 2019
Posts: 2,647
P
Phak1 Offline OP
AD Addict
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?


Phil
Moderator, The Engine Shop & Interiors

1952 Chevrolet 3100
Project Journals
Stovebolt Gallery

‘59 235 w/hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Phak1 #1339185 Thu Dec 26 2019 03:42 PM
Joined: Jan 2013
Posts: 1,679
S
'Bolter
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


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
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