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#4526431 - 09/26/17 07:26 AM 1952 Chevy DeLuxe - Radiator cap rated 16 pounds?
mrsilv04 Offline


Registered: 12/08/06
Posts: 8270
Loc: 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.
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#4526444 - 09/26/17 07:43 AM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04]
46Harry Offline


Registered: 01/08/12
Posts: 409
Loc: 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.

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#4526452 - 09/26/17 08:01 AM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04]
drtyler Online   content


Registered: 01/04/06
Posts: 405
Loc: GA

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#4526574 - 09/26/17 10:14 AM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04]
andyd Online   content


Registered: 09/25/04
Posts: 7149
Loc: 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.
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#4526591 - 09/26/17 10:32 AM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: andyd]
drtyler Online   content


Registered: 01/04/06
Posts: 405
Loc: 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.


Edited by drtyler (09/26/17 10:45 AM)

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#4526711 - 09/26/17 12:52 PM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04]
mrsilv04 Offline


Registered: 12/08/06
Posts: 8270
Loc: Illinois
Did mention it is a 235.

Didn't mention that the castings on the block suggest that it is from 1955.
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#4526719 - 09/26/17 01:03 PM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04]
GMBoy Offline


Registered: 11/22/04
Posts: 7702
Loc: Texas
My 1958 Apache has a 7lb cap. I run a 50/50 mix of traditional Green coolant.

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#4526720 - 09/26/17 01:04 PM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: 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.
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#4526740 - 09/26/17 01:22 PM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04]
drtyler Online   content


Registered: 01/04/06
Posts: 405
Loc: 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.

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#4526753 - 09/26/17 01:37 PM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: mrsilv04]
andyd Online   content


Registered: 09/25/04
Posts: 7149
Loc: 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

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#4526761 - 09/26/17 01:46 PM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: andyd]
Billbert Online   content


Registered: 10/09/09
Posts: 363
Loc: 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
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#4526863 - 09/26/17 04:16 PM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: drtyler]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3408
Loc: 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.

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#4527094 - 09/26/17 08:37 PM Re: 1952 Chevy DeLuxe - Radiator cap rated 16 pounds? [Re: Yah-Tah-Hey]
CR94 Offline


Registered: 03/20/16
Posts: 1120
Loc: Western S.C. since 1996
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.
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