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Differences in 235’s
#1424378 Fri Sep 17 2021 08:29 PM
Joined: Jun 2008
Posts: 1,553
S
'Bolter
Some 235’s have the oil filler cap in the middle and some have them up front. What years had which? I’m thinking this might be a general way to differentiate whether you are looking at an old motor or a newer version motor if you can’t see or get to the casting number easily..

Attached Files
63CA340C-69B2-45F7-89C4-3B972648DFB6.jpeg (201.01 KB, 234 downloads)

Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Re: Differences in 235’s
Spotbiltxo #1424380 Fri Sep 17 2021 08:39 PM
Joined: Sep 2001
Posts: 31,257
Bubba
Chuck,

What year ranges would be "an old motor or a newer version motor " for a head that has 4 screws around the lip/edge of the valve cover gasket?

1954-1962 had four screws.


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: Differences in 235’s
Spotbiltxo #1424385 Fri Sep 17 2021 08:56 PM
Joined: Aug 2018
Posts: 607
2
'Bolter
my ability to distinguish them at all completely fails and I rely on casting numbers

Old 235 is A dipper like a 216 and has 2 bolts on top like a 216 at least that’s what I’ve been told, not sure I have ever see this engine in person, it should have a filler at the front

Then there is a 1-2 years of a First full pressure 235 that still has two bolt ontop valve cover like 216 with filler that front
I have about 4 of these engines and it’s a work horse, it’s the default engine in all Canadian 1953 Chevy and gmc products except the big 3 ton gmc which got an actual gmc engine

Someone should make a comprehensive identification guide smile hint hint
-s

Re: Differences in 235’s
Spotbiltxo #1424387 Fri Sep 17 2021 09:51 PM
Joined: Feb 2004
Posts: 23,022
H
'Bolter
The oil fill cap position has more to do with the type of air filter the negine was originally equipped with than any magic wand to identify the engine, plus the valve covers will swap on any engine with the 4 valve cover screws around the perimeter. Casting numbers are hard to swap unless somebody is really good with a cutoff wheel and a welder!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Differences in 235’s
Spotbiltxo #1424412 Sat Sep 18 2021 01:29 AM
Joined: Mar 2005
Posts: 146
R
'Bolter
This might be what you are looking for. As earlier posted, valve covers can be easily switched, however I would consider them as a quick indicator until I checked the block numbers.

Attached Files
Valve Covers.jpg (122.17 KB, 177 downloads)
Re: Differences in 235’s
Spotbiltxo #1424430 Sat Sep 18 2021 02:32 AM
Joined: Mar 2010
Posts: 639
B
Curmudgeon
"general way to differentiate whether you are looking at an old motor or a newer version motor"

Yes but in the case of picture #1 there is a 59-62 valve cover on an engine that has the older Carter W1 carburetor and also the horn mounted to the intake manifold.
This tells me that the exact year of engine manufacture is suspect. The engine could have had a dented valve cover and a previous owner swapped it out.
The engine serial number, block & head casting dates and numbers are better identifiers if you are seriously wanting to determine the year(s).

Re: Differences in 235’s
Spotbiltxo #1424455 Sat Sep 18 2021 11:53 AM
Joined: Sep 2001
Posts: 31,257
Bubba
"This tells me that the exact year of engine manufacture is suspect. The engine could have had a dented valve cover and a previous owner swapped it out."

Maybe so, but the newer version valve cover would need four attachment screw holes drilled into an older head?

"The engine serial number, block & head casting dates and numbers are better identifiers if you are seriously wanting to determine the year(s)."

Yes - good advice - here are locations of various codes on 1954 and later 235 engines (and on all 261) engines. [1954advance-design.com] (on all USA engines - Canada & Australia might be different?)


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: Differences in 235’s
Spotbiltxo #1424469 Sat Sep 18 2021 01:54 PM
Joined: Nov 2011
Posts: 2,674
P
'Bolter
The 1954-62 valve covers with oil fill in the center are for cars, oil fill in front is found on trucks.

Re: Differences in 235’s
Spotbiltxo #1424482 Sat Sep 18 2021 03:35 PM
Joined: Jun 2008
Posts: 1,553
S
'Bolter
“The 1954-62 valve covers with oil fill in the center are for cars, oil fill in front is found on trucks.”

That’s similar to what Jerry said above. I *do* know the air filter is substantially larger in a car vs a truck, so GM probably had to move the filler cap to get out from under it.

RdsLessTaken, thanks for posting the pic of various valve covers. I’ve seen it before but forgot about it.


Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Re: Differences in 235’s
Spotbiltxo #1424485 Sat Sep 18 2021 05:09 PM
Joined: Mar 2010
Posts: 639
B
Curmudgeon
"Maybe so, but the newer version valve cover would need four attachment screw holes drilled into an older head?"

Tim, you and I are 180 degrees out. I was thinking, why an older W1 carburetor and maybe older intake on an newer 235 engine?

Paul, I would appreciate it if you can provide a reference on the "car only" center oil fill information.
The reason I ask is more for curiosity. Most likely the design change was due to lower profile hood design for 1959 cars with 235 engines.
I've read postings at other websites that SOME 1959-62 "era" trucks with 235 engines came out new with center fill position valve covers.
Maybe GM simply got rid of old inventory valve covers by installing them on new trucks.
Maybe when the supply of front fill valve covers was low enough, they simply switched over to the center fill for trucks.

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