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1952 Chevy DeLuxe - Radiator cap rated 16 pounds? #4526431
09/26/17 06:26 AM
09/26/17 06:26 AM
Joined: Dec 2006
Posts: 8,451
Illinois
mrsilv04 Offline OP
mrsilv04  Offline OP
Joined: Dec 2006
Posts: 8,451
Illinois
Noticed last night that my old 1952 Chevy Deluxe has a modern radiator cap on it, rated at 16 pounds. Although it fits properly, I'm fairly certain that a 16 pound cap isn't correct for a 65 year old car.

I would assume that it should be more like a 4 pound, or possibly a 7 pound cap.

Is there some reason (other than scarce availability of a 4 pound cap), that someone would fit a 16 pound cap here? I can't think of any.

This is a 235 cubic inch straight 6, with an original style radiator and water pump. Rock Auto has a 4 pound cap, that would appear to fit.


2004 Silverado - on its 3rd Jasper engine in less than one year.
Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04] #4526444
09/26/17 06:43 AM
09/26/17 06:43 AM
Joined: Jan 2012
Posts: 422
hawthorne, Ca.
46Harry Offline
46Harry  Offline
Joined: Jan 2012
Posts: 422
hawthorne, Ca.
A 16 lb cap is way to high for an old Chevy 6. A 4 or 7 lb cap is what I would use. I use 7 lb caps on my Studebakers and they do just fine.

Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04] #4526452
09/26/17 07:01 AM
09/26/17 07:01 AM
Joined: Jan 2006
Posts: 439
GA
drtyler Offline
drtyler  Offline
Joined: Jan 2006
Posts: 439
GA

Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04] #4526574
09/26/17 09:14 AM
09/26/17 09:14 AM
Joined: Sep 2004
Posts: 7,819
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,819
Marshfield , MA
Wow! I'm surprised you didn't push out the packing in the pump. That is a 216 CI engine a very primitive OHV 6 Babbitted bushings in the lower end. Non-permanent anti-freeze. My '40 had scoops on the rod caps. The 235 introduced in '53 was a way better engine.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: andyd] #4526591
09/26/17 09:32 AM
09/26/17 09:32 AM
Joined: Jan 2006
Posts: 439
GA
drtyler Offline
drtyler  Offline
Joined: Jan 2006
Posts: 439
GA
Maybe, maybe not.

If it's a 3 speed, the original engine is a 216. It's possible that the engine may have been changed out to a 235 in the past 65 years.

If its a Powerglide, the original engine is a low pressure 235. Basically a bored 216 with hydraulic lifters.

His car may have one of the post-1953 235s, but he hasn't mentioned which engine is in his car now.

Originally Posted By: andyd
Wow! I'm surprised you didn't push out the packing in the pump. That is a 216 CI engine a very primitive OHV 6 Babbitted bushings in the lower end. Non-permanent anti-freeze. My '40 had scoops on the rod caps. The 235 introduced in '53 was a way better engine.

Last edited by drtyler; 09/26/17 09:45 AM.
Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04] #4526711
09/26/17 11:52 AM
09/26/17 11:52 AM
Joined: Dec 2006
Posts: 8,451
Illinois
mrsilv04 Offline OP
mrsilv04  Offline OP
Joined: Dec 2006
Posts: 8,451
Illinois
Did mention it is a 235.

Didn't mention that the castings on the block suggest that it is from 1955.


2004 Silverado - on its 3rd Jasper engine in less than one year.
Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04] #4526719
09/26/17 12:03 PM
09/26/17 12:03 PM
Joined: Nov 2004
Posts: 7,805
Texas
GMBoy Offline
GMBoy  Offline
Joined: Nov 2004
Posts: 7,805
Texas
My 1958 Apache has a 7lb cap. I run a 50/50 mix of traditional Green coolant.

Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04] #4526720
09/26/17 12:04 PM
09/26/17 12:04 PM
Joined: Dec 2016
Posts: 7,151
Waco, TX
Linctex Offline
Linctex  Offline
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Posts: 7,151
Waco, TX
Wasn't the 235 basically unchanged up until around 1961 or 1962?

It may be that it can actually handle 8 psi or more.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04] #4526740
09/26/17 12:22 PM
09/26/17 12:22 PM
Joined: Jan 2006
Posts: 439
GA
drtyler Offline
drtyler  Offline
Joined: Jan 2006
Posts: 439
GA
Starting in '54, the 7 lb cap was specified by Chevy.



Originally Posted By: mrsilv04
Did mention it is a 235.

Didn't mention that the castings on the block suggest that it is from 1955.

Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04] #4526753
09/26/17 12:37 PM
09/26/17 12:37 PM
Joined: Sep 2004
Posts: 7,819
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,819
Marshfield , MA
As old Chevys go, I think the 235 was my favorite engine. In 1967, a buddy bought a beautiful 54 Belair convertible for 75$ because the top was junk.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: andyd] #4526761
09/26/17 12:46 PM
09/26/17 12:46 PM
Joined: Oct 2009
Posts: 388
California
Billbert Offline
Billbert  Offline
Joined: Oct 2009
Posts: 388
California
he biggest problem will be the design of the radiator where the tanks are soldered. design changes later on allowed for a stronger seal and higher pressures to increase the boiling temperature


If you think you can, or if you think you can't, You are probably right.

Auto Instructor / ASE Master Tech
Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: drtyler] #4526863
09/26/17 03:16 PM
09/26/17 03:16 PM
Joined: May 2014
Posts: 3,835
Columbus,Nebraska
Yah-Tah-Hey Offline
Yah-Tah-Hey  Offline
Joined: May 2014
Posts: 3,835
Columbus,Nebraska
Originally Posted By: drtyler
Maybe, maybe not.

If it's a 3 speed, the original engine is a 216. It's possible that the engine may have been changed out to a 235 in the past 65 years.

If its a Powerglide, the original engine is a low pressure 235. Basically a bored 216 with hydraulic lifters.

His car may have one of the post-1953 235s, but he hasn't mentioned which engine is in his car now.

Originally Posted By: andyd
Wow! I'm surprised you didn't push out the packing in the pump. That is a 216 CI engine a very primitive OHV 6 Babbitted bushings in the lower end. Non-permanent anti-freeze. My '40 had scoops on the rod caps. The 235 introduced in '53 was a way better engine.
Those enclosed drive lines were also the pits.Haven't heard a Blue Flame six rattling for years. One barrel carb and 6.5 compression, hottest thing in town.

Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: Yah-Tah-Hey] #4527094
09/26/17 07:37 PM
09/26/17 07:37 PM
Joined: Mar 2016
Posts: 1,645
Western S.C.
CR94 Online content
CR94  Online Content
Joined: Mar 2016
Posts: 1,645
Western S.C.
Originally Posted By: HosteenJorje
Originally Posted By: drtyler
... If it's a 3 speed, the original engine is a 216. It's possible that the engine may have been changed out to a 235 in the past 65 years.

If its a Powerglide, the original engine is a low pressure 235. Basically a bored 216 with hydraulic lifters.
...
Those enclosed drive lines were also the pits.Haven't heard a Blue Flame six rattling for years. One barrel carb and 6.5 compression, hottest thing in town.
My parents had 3 of those, a'54 car (which I eventually inherited), '55 pickup, and '61 car. Never a problem with the "enclosed drive line" of the '54. The '54 235 was rated 115 gross hp, as I recall; the Powerglide version had hydraulic lifters and was rated a bit higher. The '61 was up to 135 claimed hp, but felt much more sluggish than the '54, due to greater weight and gearing that wasn't as short.


2011 Toyota Prius now at 94K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K

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