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| | | | Joined: Nov 2007 Posts: 29 'Bolter | | 'Bolter Joined: Nov 2007 Posts: 29 | Will 1957 261 rocker arms fit on 1956-62 235 848 head ? Pm me thanks
Last edited by Peggy M; 03/01/2024 6:43 PM. Reason: added more info to the title
| | | | | Joined: Sep 2009 Posts: 6,049 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 6,049 | 39 7M, No need for anyone to PM you to answer the fitment technical question. Those aren't "state secrets" - LOL! Someone will surely be along shortly to help with that answer. If you are looking to locate/purchase rocker arms, post an ad in the Truck Parts Wanted forum. 
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Mar 2004 Posts: 6,236 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,236 | I can only provide the info from the parts book... Section 0.333 Valve Rocker Arms are the same for all 6-cylinder engines 1950-58. Valve Rocker Arms are the same for all 6-cylinder engines 1959-62. Per Section 0.269 the 848 Head was used from 1955-62 which spans both different sets of rocker arms...someone else will need to answer why they used different rockers on the same head. Mike B  | | | | | Joined: Feb 2023 Posts: 103 'Bolter | | 'Bolter Joined: Feb 2023 Posts: 103 | Due to a change in the oil delivery to the rocker shaft Chevy changed the rocker design. 1950 — 58 rockers had a groove centered in the in the hole for the shaft. On 1959 - 62 rockers the groove was offset ¼ inch to control the flow of oil. For an excellent explanation with pictures visit member Pre-68 Dave’s blog ( Chevy 235 guy). His site has an amazing amount of great information including the item listed as "235 rocker oiling". The information applies to the 261 as well.
1954 Chevy 1300 engine 235 (1959)
1955 (first series) Chevy 3100 engine 261 (1957)
1927 (other brand) Model T- engine 327 (1968)
| | | | | Joined: Sep 2011 Posts: 1,462 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,462 | The question is, what year is your block?
The rocker arm asm. you need depends on the year of the engine block, not the head.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Feb 2019 Posts: 4,516 AD Addict & Tinkerer | | AD Addict & Tinkerer Joined: Feb 2019 Posts: 4,516 | As No1300 has pointed out, one of our own ‘bolters “Pre ‘68 Dave” is an expert on these Stovebolt engines and has a website that show the differences in the rockers and oil supply thru the years these engines were made. Here is a link.
Phil Moderator, The Engine Shop, Interiors and Project Journals1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc BrakesProject JournalsStovebolt Gallery Forum | | | | | Joined: Nov 2007 Posts: 29 'Bolter | | 'Bolter Joined: Nov 2007 Posts: 29 | | | | | | Joined: Feb 2004 Posts: 29,888 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,888 | The rocker arms and shafts will bolt on and fit properly, clear back to ones used on 216, 235, and 261 engines from the early 1940s, through the early 1960s. Different arrangements will need to be made for proper oiling, depending on the year of manufacture of the engine, and some cylinder heads.
Jerry
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