C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Radiator Cap

Old Apr 17, 2008 | 03:16 PM
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Default Radiator Cap

What Pound Radiator Cap Is Required For A 1986? I Have A 7lb On Now , Do I Need To Change It?
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Old Apr 17, 2008 | 03:20 PM
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A quick call to your local parts store will get you an answer.
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Old Apr 17, 2008 | 03:38 PM
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actually GM is still selling these, just bought one the other day for a 1990. something like 11 bucks. 17 LB on the 90-96, got me on the 84-89 but 7 sounds awful light.
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Old Apr 17, 2008 | 05:15 PM
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Originally Posted by racebum
actually GM is still selling these, just bought one the other day for a 1990. something like 11 bucks. 17 LB on the 90-96, got me on the 84-89 but 7 sounds awful light.
My late 86 came with a 17 psi cap.
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Old Apr 17, 2008 | 10:30 PM
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I know with a lower pressure cap, your coolant will boil over at a lower temperature, but at the same time, you are putting less pressure on the cooling system and less stress on the old radiator hoses. As long as the coolant is at a 50/50 mix and doesn't reach past 240 instead of 260, I would say it is fine.
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