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261 valve assembly confusion
#1400481 Mon Mar 08 2021 02:31 AM
Joined: Sep 2020
Posts: 12
N
'Bolter
Hello all.
Something about the valve assembly on my 261 doesn't look right. I bought this engine to rebuild.

Serial number: none. Not ground off, just blank.
Engine block: 3769925 date: C307
(No 3679925 casting in 1957. 67' replacement block?)

Head: 3836850 Date: 14G2

The rockers have the oil groove on the middle (57 style) but has the pinched off oil connector (59-62 style).
Additionally, a lead ball is jammed into the oil connector at the bottom. Why?

This engine has been rebuilt at some point in the past due to obvious signs. One of the springs on the rocker shaft was missing (small spring in the middle) which lead to the rocker getting beaten up.

Is the rocker shaft as transplant? What is going on with this thing.
Thanks!

Attached Files
6FDB39DB-C453-4A64-A3CB-B5014D00D0EE.jpeg (236.22 KB, 206 downloads)
FB134EE9-28A6-4D11-AC52-C99F348FF754.jpeg (379.77 KB, 208 downloads)
93551186-E9CE-4581-8C12-306DFC09BB8A.jpeg (497.42 KB, 197 downloads)
Re: 261 valve assembly confusion
NeptuneGreen55 #1400531 Mon Mar 08 2021 01:42 PM
Joined: Feb 2019
Posts: 1,620
P
AD Addict
Does the lead ball have a small hole bored thru it?


Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: 261 valve assembly confusion
NeptuneGreen55 #1400545 Mon Mar 08 2021 02:38 PM
Joined: Feb 2019
Posts: 1,620
P
AD Addict
There is a member on this forum Pre ‘68 Dave, that has a good write-up about the different rocker oil supply systems that Chevy used on the 235/261 engines that may help you figure out your mystery. Here’s a [LINK] [chev235guy.blogspot.com]


Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: 261 valve assembly confusion
Phak1 #1400551 Mon Mar 08 2021 03:06 PM
Joined: Sep 2001
Posts: 31,055
'Bolter
Originally Posted by Phak1
There is a member on this forum Pre ‘68 Dave, that has a good write-up about the different rocker oil supply systems that Chevy used on the 235/261 engines that may help you figure out your mystery. Here’s a [LINK] [chev235guy.blogspot.com]

As Phil posted - Dave's write-up is excellent and is very helpful.

Here are additional photos and information regarding 1938-1963 Stovebolt-engines' rocker-arm lubrication. [1954advance-design.com]


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 261 valve assembly confusion
NeptuneGreen55 #1400566 Mon Mar 08 2021 06:07 PM
Joined: Jan 2001
Posts: 5,078
P
'Bolter
Could you show a complete picture of the side of your engine so I can get a better idea of the year?


See the USA in your vintage Chevrolet!
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Re: 261 valve assembly confusion
NeptuneGreen55 #1400576 Mon Mar 08 2021 07:31 PM
Joined: Feb 2019
Posts: 1,620
P
AD Addict
Could you also post a picture of the casting code on the head and better picture on the date code on the head or just tell us what it is. From your picture it looks like 14C2 or 14G2.


Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: 261 valve assembly confusion
Phak1 #1400580 Mon Mar 08 2021 07:48 PM
Joined: Sep 2020
Posts: 12
N
'Bolter
The lead plug has no hole. It is completely blocked. The block does has the oil tube behind the side cover. Thanks for the links. I checked out both sites before I posted. Still confused as the lead plug.

Per my initial post: Head: 3836850 Date: 14G2
both the date code and the casting number of the head are under the valve cover. THe date code is on the left, the casting number (3836850) is on the right.

If you look at the "6" in the casting number, look straight down and you'll notice the faint outline of a "T" outside the valve cover. I'm assuming it means Truck.

My bottom line question is: What rockers to use with this configuration. Pre 57 or 58-62.


I'll try to get a pic of the side of the block later.

Attached Files
head1.jpg (72.8 KB, 93 downloads)
Re: 261 valve assembly confusion
NeptuneGreen55 #1400595 Mon Mar 08 2021 11:06 PM
Joined: Dec 2018
Posts: 413
F
'Bolter
Neptune Green55 Maybe your rockers are mixed -up in location read the manuel,also look for wear on stems and rockers. older valve refacers had fixtures to dress the rockers.

Re: 261 valve assembly confusion
NeptuneGreen55 #1400606 Tue Mar 09 2021 12:00 AM
Joined: Sep 2001
Posts: 31,055
'Bolter


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 261 valve assembly confusion
NeptuneGreen55 #1400612 Tue Mar 09 2021 12:36 AM
Joined: Sep 2020
Posts: 12
N
'Bolter
More pictures

Attached Files
C4599D98-9763-4CA1-A753-D9237E6594EE.jpeg (464.87 KB, 105 downloads)
3B1AE0B2-4434-43FF-9DBF-550F7C3D34A3.jpeg (350.37 KB, 111 downloads)
7173A97A-7234-401B-AE84-C2885B3287DD.jpeg (361.36 KB, 106 downloads)
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