Correct Radiator Cap 1971 454?
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Joined: Sep 2004
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From: Phoenix Arizona
Correct Radiator Cap 1971 454?
I have a 1971 454 LS5 with Air Conditioning. My original Corvette owners manual says the radiator cap is an RC25. Yet, I've always found that most people say it should be a RC15.
Anyone know for sure what should be on my car?
Anyone know for sure what should be on my car?
Drifting
Joined: Jan 2004
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From: Sherman CT
2023 C3 of the Year Finalist - Unmodified
2019 C3 of Year Finalist (stock)
St. Jude Donor '24-'25-'26
Both of these units should be fitted with a RC-15 cap on them.An aluminum expansion tank that came on 1971 base motor cars, ZR1 cars, LS5 with out A/C, LS6 cars, and ZR2 cars had the RC-26 caps on them. Both the RC-15 and the RC-26 caps were rated to hold 15 pounds of pressure
Hope this helps
Regards
Roy
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From: Phoenix Arizona
Thanks everyone. The interesting thing is that my owners manual says RC25. I do have the copper rad with the brass overflow tank. The overflow tank is the only place for a rad cap as the radiator has the nipple for the hose that goes to the overflow tank.
Maybe the owners manual has a typo and that it should have been rc26.
Maybe the owners manual has a typo and that it should have been rc26.
Safety Car
Joined: Apr 2000
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From: Wichita KS
Thanks everyone. The interesting thing is that my owners manual says RC25. I do have the copper rad with the brass overflow tank. The overflow tank is the only place for a rad cap as the radiator has the nipple for the hose that goes to the overflow tank.
Maybe the owners manual has a typo and that it should have been rc26.
Maybe the owners manual has a typo and that it should have been rc26.
cc
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From: Phoenix Arizona
I have a RC15 cap that has small ears. Other RC15 caps have big ears. Can anyone tell me why? Was the original cap that came on the a big ear type RC15 and later did AC Delco change to small ears? Or did it come with the small ear cap and later changed to big ears?
