Radiator Cap

JoeyJoeJoe · Veteran Member

Radiator Cap

Prefectca · Poncho Master!

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

seventy2plus2 · Canadian Poncho Superstar!

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.

JoeyJoeJoe · Veteran Member

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.

unruhjonny · Guru

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

unruhjonny · Guru

Here is an inexpensive RC15 option:

www.ebay.ca/itm/172275269174

Greaser · Canadian Poncho Superstar!

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

CdnGMfan · Canadian Poncho Superstar!

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.

4SPEED427 · A Poncho Legend!

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

DonSSDD · Canadian Poncho Superstar!

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

Glenn Musgrave · Addicted!

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.

4SPEED427 · A Poncho Legend!

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.

OURWAGON · Guru

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.