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Post Info TOPIC: Radiator Cap


Veteran Member

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Radiator Cap


Looking for the correct radiator cap, or suitable replacement, for my 59 Parisienne. I think it's the original radiator, pics attached, made of copper o20230620_075759.jpgf brass. I believe it's supposed to be an RC-15 cap but they want a pretty penny for one of those. What else will work? I was going to tey a Stant 13psi cap or an RC-6 instead. 



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Poncho Master!

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If I recall, the original cap would have been 13 psi. If youre not concerned about the appearance any auto supply should be able to get it.

Paul

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Canadian Poncho Superstar!

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My old 57 Chevy was a 7 lb cap, it was an RC7 cap by AC Delco. Not sure what pressure rating was correct for 1959.

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70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop
72 GMC Sierra

 

 



Veteran Member

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I was reading elsewhere that the copper/brass tanks require a specific cap rc-15 which is expensive so I figured there must be a cheaper option that's compatible? I'm not too worried about the pressure as it's a more modern sbc. I'll probably try a 13psi stant and see if that does the trick.



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"If they don't find you handsome, they should at least find you handy" - Red Green


Guru

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EDIT: I just saw your RC15 comment.

There is alot of old stock stuff on eBay ect.

 

An RC15 is a 15lb cap;

there are many Delco caps that look similar.



-- Edited by unruhjonny on Tuesday 20th of June 2023 10:24:55 PM

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1970 Formula 400
Carousel Red on black (std) interior
"no drivetrain option" car (same base drivetrain as GTO)
1:411 1970 Firebird Formulas originally sold in Canada

Luke 23: 39-43 / Ephesians 2: 8-9  / 1 Corinthians 2:12-14 / 2 Timothy 3:1-5;12



Guru

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Here is an inexpensive RC15 option:

www.ebay.ca/itm/172275269174

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1970 Formula 400
Carousel Red on black (std) interior
"no drivetrain option" car (same base drivetrain as GTO)
1:411 1970 Firebird Formulas originally sold in Canada

Luke 23: 39-43 / Ephesians 2: 8-9  / 1 Corinthians 2:12-14 / 2 Timothy 3:1-5;12



Canadian Poncho Superstar!

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Rad Caps

https://www.amazon.ca/s?k=rockauto+parts+canada+radiator+cap&crid=2V1FO46OL3INJ&sprefix=rockauto+parts+canada+radiator+cap%2Caps%2C168&ref=nb_sb_noss

 

https://www.summitracing.com/parts/ado-rc27



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Canadian Poncho Superstar!

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In 1989 I walked in and bought an RC-15 cap off the shelf for cheap at Bob Johnston Chev-Olds (r.i.p.). It looks & functions like OEM because it was, but the ears were slightly smaller, though you wouldn't know it unless you trained you eyes for it. At least a modern one today would be AC Delco and a functional equivalent to OEM.

Stant is an obvious deviation from stock in appearance, but may also include a release lever.

I'm glad I kept the rusty original 1967 big ear cap. I should try one of those electrolytic baths to restore it. For show only, though it worked fine when I decommissioned it in 1992. GM Mark of Excellence.

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A Poncho Legend!

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If it helps at all, 3852236 is the GM original number for the 59 Canadian Pontiac cap and it's listed at 13 pounds.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars



Canadian Poncho Superstar!

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Rockauto list 2, you may find one at a Canadian tire or Napa? I checked a 1959 BelAir 283, check the price. 

IMG_7041.png



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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic



Addicted!

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Not sure where this all ended but take the part number 4SPEED427 gave you and contact your local GM dealer, they can order it in. That's what I did in Sept. Cost was $30 + tax. no messing around with US dollars, shipping etc.

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A Poncho Legend!

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I'm glad you mentioned this. There's a newer number I should have posted. 19114580 is the newest number. It doesn't look identical to the original but will fit and work fine.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars



Guru

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Prefectca wrote:

If I recall, the original cap would have been 13 psi. If youre not concerned about the appearance any auto supply should be able to get it.

Paul


 ANY I HAD WERE 13 LBS.



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