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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

radiator cap question

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Old May 27, 2007 | 03:56 PM
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Default radiator cap question
what is the radiator cap pressure on a 1996 LT1??
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Old May 27, 2007 | 07:23 PM
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17lbs I believe
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Old May 27, 2007 | 08:12 PM
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damn i have a 15 on mine. thanks for the info
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Old May 27, 2007 | 08:13 PM
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15-16 psi roughly should hold pressure for 10 minutes when testing.
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Old May 27, 2007 | 10:12 PM
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I thought stock was 18lb.
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Old May 28, 2007 | 09:46 AM
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^^^ I'm with him, 18lbs.
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Old May 28, 2007 | 10:17 AM
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Okay the reason I am asking is because my car is always overheating. The fan does come on. The water pump also does come on. It has a griffin radiator. I think the fan may be a problem because it is a stock fan off of my old motor which was a 305. The cooling system will easily hold 16 psi all day. It has the stock thermostat. It does only have a 15 lbs cap on the radiator. I think that may be a problem also.
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Old May 28, 2007 | 12:47 PM
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I second the 18lbs i believe that is the stock one
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Old May 28, 2007 | 02:06 PM
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i thought it was 18 or 19 but the cap i have now is 18
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Old May 28, 2007 | 03:25 PM
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Well I have a custom Griffin radiator and the guy told me 17lbs, so the stock LT1 radiator may be a little different.
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Old May 28, 2007 | 04:27 PM
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i just put an 18 lbs cap and it seems to have helped but i am not positive yet. we will see
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