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Re: Differences in 235’s
buoymaker #1424487 Sat Sep 18 2021 05:30 PM
Joined: Mar 2004
Posts: 5,237
M
'Bolter
Originally Posted by buoymaker
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?

The older 216 parts bolt right on to the newer 235, so someone had a bad engine, bought a new long block and swapped all of the old bolt-on parts onto it...done all the time!

Mike B smile

Re: Differences in 235’s
Spotbiltxo #1424504 Sat Sep 18 2021 09:01 PM
Joined: Jan 2000
Posts: 2,159
J
'Bolter
Odd ball me, running an old style 216 valve cover on my 261! All you need to do is remove two rocker shaft bolts and replace with 'STUDS' from 216. But that's really not the issue here, as stated engine serial number and cast numbers tell the true story.


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy [stovebolt.com]
1953 Chevy 3/4-ton Factory Stakebed [stovebolt.com]
Re: Differences in 235’s
Spotbiltxo #1424505 Sat Sep 18 2021 09:17 PM
Joined: Feb 2004
Posts: 23,022
H
'Bolter
Even with the 2 bolt valve cover, Ray Charles could figure out that there's a late model engine in a pre-54 truck. I'm getting pretty close to putting my 258 cubic inch "216" together, one that looks original from the outside.
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 #1424509 Sat Sep 18 2021 09:56 PM
Joined: Jun 2008
Posts: 344
S
'Bolter
Would someone please explain to me why the 1954 cover has vents and the later covers do not. What would happen if you ran the '54 vented cover on a later engine? What would happen if you ran the non-vented cover on the '54 engine?

Re: Differences in 235’s
Spotbiltxo #1424513 Sat Sep 18 2021 10:18 PM
Joined: Sep 2001
Posts: 31,257
Bubba
Put a vented valve cover cap onto the 1954 non-vented valve cover and you engine will be OK.

Do you have a PCV valve?
If you you do, show a photo of the “plumbing” and the valve cover.

Depending on the PCV set-up (and valve cover) you may need to replace the valve-cover to a valve cover with no “slits” in the top of it?

Stove, I posted this while you were posting your last post

Last edited by tclederman; Sat Sep 18 2021 10:20 PM. Reason: Added clarification information.

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 #1424548 Sun Sep 19 2021 04:27 AM
Joined: Mar 2010
Posts: 639
B
Curmudgeon
"The older 216 parts bolt right on to the newer 235, so someone had a bad engine, bought a new long block and swapped all of the old bolt-on parts onto it...done all the time!"

I refer to the older 235 as one from 1941-49 (mostly military trucks) and 1950-1953 cars & trucks. A "newer" 235 as one from 1954-62 cars & trucks.

The intake ports of a 216 are smaller than the 54-62 235 so fabricated alignment/adapter rings are needed (turbulence?) but a 216 carburetor is undersized (run rich?) and may need modification.
The water pump, in the picture, looks like a shortened shaft 1955 2nd or later design so the 216 water pump wasn't used.
The water pump pulley and belt doesn't look to be 5/8" (216 truck) so I suspect the 216 crank dampener was not used. Generator or generator pulley changed?
The distributor cap looks to be a 216 and if the distributor is a 216 then the drive gear needs to be change to match the 54-62 235 camshaft.

If I was spending money on a new long block, back in the day, I wouldn't mess it up by putting questionable parts on it.
On the other hand, if the long block was from a junk yard and was used to keep a farm truck running then I guess it would be good enough.

Re: Differences in 235’s
RdsLessTaken #1424561 Sun Sep 19 2021 12:00 PM
Joined: Dec 2018
Posts: 797
F
'Bolter
Rds Less Taken Good shot on covers,with explanation,thanks. Patricks of phoenix ?? had a lot of info on identifying blocks and saginaws in his catalog. Think he hung it up though !!

Re: Differences in 235’s
buoymaker #1424562 Sun Sep 19 2021 12:15 PM
Joined: Dec 2018
Posts: 797
F
'Bolter
buoymaker there were a lot of babbitt 235's in the big trucks in the form of grain trucks,right ?? Domestic run of the mill.

Re: Differences in 235’s
Stove #1424564 Sun Sep 19 2021 12:35 PM
Joined: Feb 2019
Posts: 2,125
P
AD Addict
Originally Posted by Stove
Would someone please explain to me why the 1954 cover has vents and the later covers do not.

The vented valve covers were part of the crankcase ventilation system to exhaust contaminated gasses from the crankcase. The road draft tube created a vacuum in the crankcase (@ 30 MPH) and the vented valve cover allowed fresh air to enter, replacing the fumes. Later, GM figured out that unfiltered air, sucking dust and other contamination into the engine, shortened the engine life. The first attempt at fixing this issue was to eliminate the vents and add a vented oil fill cover. Unfortunately filter media was adequate enough to filter only the largest particles and not the dust. Also this system on relied on speed and did not work at idle or lower speed typically seen in a city environment.

The answer had been an option in their truck fleet for years, a closed PCV system which got later incorporated into most engines by the mid sixties.


Phil

1952 Chevrolet 3100
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Re: Differences in 235’s
Spotbiltxo #1424588 Sun Sep 19 2021 06:12 PM
Joined: Mar 2010
Posts: 639
B
Curmudgeon
Edit out "vented oil fill" and add "connection to air cleaner". See pictures.

Attached Files
PCV 01.jpg (58.45 KB, 40 downloads)
PCV 02.jpg (115.82 KB, 40 downloads)
PCV 03.jpg (42.93 KB, 42 downloads)
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