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the one thing i noticed is you said your fan is 3 inches from the radiator. it needs to be about 1 - 1 1/2 inches from radiator. We run a piece of flexable plastic on the front of the skid pan. You want it 3 inches lower than the nose of the car so the air can hit it and deflect it up into the radiator. if you use a flexable piece like from an old side skirt it will flex when it hits the track.
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Thanks for all the helpComment
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heat
most over looked jetting u car go from 250 to 150 with just a couple # sComment
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Overheating
I fought this the overheating problem for ever and finally came upon the problems. I had everything perfect, fan shroud, timing, belts, pullys, jetting, you name it it was there. First we found that 32 degrees of timing was the culprit. Advanced timing to 34 and that fixed the problem. The other issue was we ran water in radiator. You need to run antifreeze. Most people tell you water cools better, but they are wrong. The reason is water has a low boiling point. When water boils you loose water which in turn makes motor run hotter. When we switched to antifreeze, I never lost anymore water from my cooling system. These two things combined will make a huge difference in your cooling. Remember though, everything else has to be right as well.Comment
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water
if your water is boiling u neen a good cap pressure keep water from boiling put a 32 lb cap on it with water thats y nascar has a pressure type of water systemComment
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Anti Freeze it just what it says. It runs hotter. Many tracks do not allow it because if you loose any on the track the next car is that hits it is going to hit the wall. The GM fastburn heads are designed to run at 32 degrees we ran them 100 laps in Fla at 95 degree air temps and never had in issue. With a proper system water is all you need, Nascar turns the engines 9000+ and they run water!Comment
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