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Rocker order
#1406411 Sat Apr 17 2021 02:06 PM
Joined: Jan 2013
Posts: 1,962
'Bolter
Gents,

As I put together my rail with new parts, I’ve come across an issue. When I look through my manual, it’s telling me the order of the rocker arms by a number on the side of them. For the life of me, I can’t find these numbers in the manual. 01, 02, 11, 12. I took them off of a 848 head. Any assistance would be greatly appreciated. A webpage would be even better so I can put it in my resource file to help others.

Thanks,

Chris

Re: Rocker order
ndkid275 #1406427 Sat Apr 17 2021 04:04 PM
Joined: Jan 2001
Posts: 5,100
P
'Bolter
Rocker positions.
If you lay each rocker on it’s side you can quickly determine the left and right angle.

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Re: Rocker order
ndkid275 #1406429 Sat Apr 17 2021 04:27 PM
Joined: Jan 2013
Posts: 1,962
'Bolter
Dave,

That is my plan. I figured having a reference to check my work would probably have a better end state. I don’t have the money to rebuild it again.

Chris

Re: Rocker order
ndkid275 #1406435 Sat Apr 17 2021 05:30 PM
Joined: Aug 2017
Posts: 577
S
'Bolter
Do your rocker arms have a "85" or "86" stamped on them?
This was my cheater when I put my "848" head together.
Those are GM part numbers. Hope it can help.
Todd

Attached Files
20210417_103223.jpg (70.11 KB, 204 downloads)
Last edited by Shaffer's1950; Sat Apr 17 2021 05:35 PM.
Re: Rocker order
ndkid275 #1406440 Sat Apr 17 2021 05:59 PM
Joined: Dec 2008
Posts: 1,585
P
'Bolter
There are 3 each of 4 different rocker arms: a left and right of both intake and exhaust: 3 left intakes, 3 right intakes, 3 left exhausts, 3 right exhausts.
The rocker arm installation order on the rocker shafts is always alternately offset left-right-left-right.
The order of the rockers on the shaft from either end is the same as the order of the valves and cam lobes: ex - in - in - ex - ex - in - in - ex - ex - in - in - ex
For each cylinder, its intake and exhaust rocker arms’ long (points to its valve stem) levers (always a left & a right) point toward each other (converge) as they approach the valve stems.
For each cylinder, its intake and exhaust rocker arms (always a left & a right) are always separated on the shaft by a rocker stand.
Each adjacent pair of intake valves (in a cylinder pair, e.g., #1 & 2, or #5 & 6) or exhaust valves (in a cylinder pair, e.g., #2 & 3, or #4 & 5) are always separated by a span of exposed rocker shaft and a spring, or (#3 & 4 intakes) are separated by the oil connector.
When assembled, each each rocker must align with its pushrod on one side, and be directly above its valve stem on the other. Any that do not are wrong.

Re: Rocker order
ndkid275 #1406537 Sun Apr 18 2021 01:34 PM
Joined: Dec 2018
Posts: 619
F
'Bolter
ndkid275 It's a nightmare,we all had to learn like you are,you'll know now to lay them out in order half at a time BTDT been there done that !!

Re: Rocker order
panic #1406539 Sun Apr 18 2021 01:37 PM
Joined: Dec 2018
Posts: 619
F
'Bolter
panic I used to think these engines were pretty simple LOL !!

Re: Rocker order
ndkid275 #1406543 Sun Apr 18 2021 02:00 PM
Joined: Feb 2019
Posts: 1,859
P
AD Addict
I see from previous post that you are assembling a ‘61 261. One thing that I should caution you about, is making sure you have the right rocker arms. In 1959, GM changed the design of the 235/261 rocker arm oiling system to pressurize the rocker arms. This involved the elimination of a 1/16” orifice and the addition of offset grooves on the ID of the rockers. One of our fellow ‘bolters, Pre ‘68 Dave, explains this on his website really well and I would strongly suggest reading this. Older rockers can be used on newer engines, but it’s not just as simple as bolting on the rockers.

Here is a link to his article. https://chev235guy.blogspot.com/search/label/235%20Rocker%20Oiling


Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: Rocker order
ndkid275 #1406631 Mon Apr 19 2021 02:48 AM
Joined: Jan 2013
Posts: 1,962
'Bolter
I assume after what I read that I have a later 848 head as the temp gauge hole is larger like talked about in the article. larger. It also has a “B10” date code under the valve cover which I can’t seem to find what the actual date is. I assume “B” is February and the “10” is 1960? Does that sound right? Or Feb 1, 1960

Last edited by ndkid275; Mon Apr 19 2021 03:00 AM.
Re: Rocker order
ndkid275 #1406651 Mon Apr 19 2021 11:51 AM
Joined: Feb 2019
Posts: 1,859
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Originally Posted by ndkid275
I assume after what I read that I have a later 848 head as the temp gauge hole is larger like talked about in the article. larger. It also has a “B10” date code under the valve cover which I can’t seem to find what the actual date is. I assume “B” is February and the “10” is 1960? Does that sound right? Or Feb 1, 1960
Yes it does sound right. Now, If your oil supply tube in the middle of the rockers is closed off and the individual rockers have offset grooves, like the pictures below, your good to go.

Attached Files

Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
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