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04-27-2024
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#1 |
 Join Date: Jan 2024
Location: Hawaii
Posts: 14
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Radiator Cap
I am looking to buy a new radiator cap for my 90. The cap currently on there is an AC Delco 17 psi., HC-44 with two ears on the side. It looks very old and the rubber is deteriorating. I see an AC Delco RC 81 on rock auto for sale. this RC 81 has a 15 psi rating and no ears on it for turning. Any suggestions? What s the best cap and rating to buy?
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05-02-2024
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#2 |
 Join Date: Aug 2006
Location: McLean, VA
Posts: 3,721
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Re: Radiator Cap
Below, I believe, is what came with the car and replaced with the same about 10 years ago. AC-Delco 15 psi.
https://www.ebay.com/itm/29509399874...2f7a7800fb2068 |
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05-03-2024
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#3 |
 
Join Date: Jul 2015
Location: Jerica - SPAIN
Posts: 307
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Re: Radiator Cap
Hi! You have AC Delco RC44 17psi available in Summit Racing (there are two other 17 psi caps from Griffin Radiators brand)
I don't know if it's good for our LT-5's the 15 or 16 psi caps. Service manual and technical information specifies 17 psi caps.
__________________
 1.990 Chevrolet Corvette ZR-1 #2342 - Black/Black - March 1.990 - OBX Headers and OBX complete Exhaust Line (No Cats). K&N Air Filter with open Air Box. Jerry's Gaskets Silicone Air Duct. DeWitts Two Row Pro Series Radiator. Samco's Hose Coolant Kit. ECM/EPROM Improved. MSD Spark Plug Wires 8,5mm Super Conductor. EBC Brakes YellowStuff with EBC D-Series Rotors and Raybestos hoses. |
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05-03-2024
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#4 |
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Join Date: Jul 2015
Location: Jerica - SPAIN
Posts: 307
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Re: Radiator Cap
When you select "1990 Corvette" to check the caps suitability only appear AC Delco RC44...
__________________
1.990 Chevrolet Corvette ZR-1 #2342 - Black/Black - March 1.990 - OBX Headers and OBX complete Exhaust Line (No Cats). K&N Air Filter with open Air Box. Jerry's Gaskets Silicone Air Duct. DeWitts Two Row Pro Series Radiator. Samco's Hose Coolant Kit. ECM/EPROM Improved. MSD Spark Plug Wires 8,5mm Super Conductor. EBC Brakes YellowStuff with EBC D-Series Rotors and Raybestos hoses. |
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05-03-2024
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#5 |
 
Join Date: May 2010
Location: Japan
Posts: 3,583
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Re: Radiator Cap
I know stock is 17 lb cap, but I have been running this Mr.Gasket one for as long as I can remember, but they were half the price then. It is 16 lbs and never had a problem. If you only want stock sorry and please disregard. They come in red and blue too. Don?t mind me I?m always different. 😂🤙🏼
https://www.jegs.com/i/Mr-Gasket/720/2476BK/10002/-1
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Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 
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05-04-2024
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#6 |
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Join Date: Jan 2024
Location: Hawaii
Posts: 14
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Re: Radiator Cap
Thanks for the help
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05-13-2024
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#7 |
Join Date: Sep 2016
Location: Ocala, FL
Posts: 895
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Re: Radiator Cap
ACDELCO RC27 Is the 15psi cap you want. Available rockauto.
__________________
Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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05-17-2024
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#8 |
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Join Date: Jan 2024
Location: Hawaii
Posts: 14
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Re: Radiator Cap
I purchased two radiator caps from summit :
ACDelco 6410962 - ACDelco Radiator Caps Part Number: ADO-RC44 $10.79 each Thanks everyone....I am a stock kinda guy and the 17 psi one seems like the best fit for me since it will be the same thing that has been on there for most likely 167,000 miles! Last edited by Blak90zr1; 05-17-2024 at 11:40 PM. |
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Linear Mode
