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235 #1330281 Fri Oct 18 2019 01:15 AM
Joined: Oct 2019
Posts: 31
W
WarEagle1 Offline OP
Wrench Fetcher
On Page 9 of Deve Krehbiel's book on how to rebuild the inline-6 engine, he states "...the desirable years are 1954-1962 with the 1958-1962 being the most desirable because of all the lessons learned by Chevrolet through the years".

So, what is the major difference between say a 1955 235 and a 1960?

Thanks

Re: 235 [Re: WarEagle1] #1330284 Fri Oct 18 2019 01:43 AM
Joined: Aug 2019
Posts: 77
O
Ott3r Offline
Shop Shark
There were several oiling system changes during that time period.
Check out this article:
http://chev235guy.blogspot.com/2015/04/235-rocker-oiling-evolution.html


'59 Chevy Suburban, NAPCO
Re: 235 [Re: WarEagle1] #1330286 Fri Oct 18 2019 02:15 AM
Joined: Dec 2017
Posts: 600
D
Dragsix Offline
Shop Shark
Oil system changes as noted above, slightly higher compression ratio if the shop manual is to be believed. Some other things, for example in 55 gm was still using a rope rear main seal. In 60 those motors were using the much improved neoprene seal (that actually began in 56). Also in 55, all stick motors used a block that was machined for solid lifters only. This was trucks and cars. For the cars with automatic transmissions, they received a different block, one that was machined for hydraulic lifters. That distinction ended for the 1956 models, although I can’t say for certain whether the 56 and up trucks used a solid lifter only motor (they may have) only because I have never had one in my hands. Maybe one or the other guys can chime in on that. But never shy away from a 55-58 motor. They are great runners just like the 59 and up motors

Last edited by Dragsix; Fri Oct 18 2019 02:19 AM.

Mike
Re: 235 [Re: WarEagle1] #1330339 Fri Oct 18 2019 03:21 PM
Joined: Nov 2000
Posts: 1,746
F
Frank50 Offline
Shop Shark
I bought Deve's book too and found it to be a valuable resource. Though I do not agree with all of his advice. I do agree with his assessment that the late 235's are the better ones. Though there are challenges to putting one in a 55-1st or older truck, mostly because of the water pump. http://chev235guy.blogspot.com/search/label/Water%20Pump%20Relocation%20Adapter


Professional Novice
Re: 235 [Re: WarEagle1] #1330343 Fri Oct 18 2019 04:33 PM
Joined: Sep 2001
Posts: 29,127
tclederman Offline
Boltergeist
No truck 235/261 engine had hydraulic lifters (except, maybe, in/on an early 60’s truck that had a Powerglide transmission).

The higher compression “848” head (1956 and later engines) provided improved/higher performance compared to earlier high-pressure-235 heads.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- 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 engine are not "splash oilers" - this is a splash oiler.
Re: 235 [Re: WarEagle1] #1330350 Fri Oct 18 2019 05:47 PM
Joined: Sep 2009
Posts: 230
G
Green_98 Offline
Shop Shark
Weren’t hydraulic lifter motors found in Canadian made cars? Correct me if I am wrong.

Last edited by Green_98; Fri Oct 18 2019 05:47 PM.

-Patrick
1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red

Re: 235 [Re: WarEagle1] #1330360 Fri Oct 18 2019 06:24 PM
Joined: Jan 2013
Posts: 1,558
S
sstock Offline
Shop Shark
Believe all cars had hydraulic lifters after 55


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, 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
Re: 235 [Re: WarEagle1] #1330383 Fri Oct 18 2019 08:37 PM
Joined: Dec 2017
Posts: 600
D
Dragsix Offline
Shop Shark
Canadian Pontiacs used essentially the 55-58 bypass 261 block with an 848 head (with steam holes) and those blocks were drilled for hydraulics so you could use either hydraulic or solid lifters. Yes, no truck used hydraulic lifters. The question I don't have an answer to is notwithstanding that truck blocks came with solid lifters, were they drilled for hydraulics. In other words, did GM do away with the separate block distinction like they did in the automobile line or did they continue to use blocks in the truck line that were solid lifter only and if they did for how long. I just dont know the answer to that.


Mike
Re: 235 [Re: WarEagle1] #1330395 Fri Oct 18 2019 09:16 PM
Joined: Jan 2001
Posts: 4,871
P
Pre '68 Dave Offline
Shop Shark
Starting in 1958 all 235's were drilled for hydraulic lifters whether used or not.
This was because of the new rocker oiling set up that flowed oil around each lifter and up a cast in galley in the center of the block.
261's seem to have a different time line for this change, which I have not confirmed.


See the USA in your vintage Chevrolet!
My Blog
Re: 235 [Re: WarEagle1] #1330398 Fri Oct 18 2019 09:46 PM
Joined: Mar 2019
Posts: 478
G
glenns towing Offline
Shop Shark
Yes the 261s didn't follow suit as the 235s, but I dont have the exact knowledge of the specs,. Im sure the experts will chime in.... Hopefully.. dance

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