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Old 08-23-2013, 10:59 PM   #1
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67 Running Hot...Still

I've had the car a year, motor was rebuilt a few years ago, before I got it. It's a 67 289 block with 72' 302 heads. It ran hot when I got it. Here's what I've done to it since. New Auto meter gauges, new sending units, new Edelbrock Performer 289 intake, Rebuilt the Edelbrock 600 Carb, Rebuilt the C4, new front suspension, new pads, rotors on front, new brake booster, new master cylinder, new water pump, new thermostat ( I think it's a 160), new 3 core radiator, new heater and box, new fuel pump, new fuel tank, new front seats, etc.
Now that I have real gauges, it's running about 235, even on the highway, it's not a stop light heat up. It just seems to start running hot as hell. The radiator seems to flow. It has the Duraspark ignition, which was already on it. I've had a few electrical issues and started using relays. All the wires for the gauges are new with the exception of the backlights, I used the original instrument panel light wires to keep the ability to dim. I had some twitching on the tach when emergency flashers were on or blinkers. I've read that low voltage to the coil can cause an overheating. Is this a possibility or is it the thermostat should be 190? Any help would be appreciated.
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289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.
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Old 08-24-2013, 03:11 PM   #2
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Do you have a fan shroud ?
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Old 08-24-2013, 08:38 PM   #3
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Hey aggies, I also had heat issues with my big block. First thing I did was put on the strongest electric fan I could find that fit and also a shroud.
It took me a while to understand and accept the idea of that shroud....it made a huge difference. I run around 190' reg driving and hot at about 210ish.
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Old 08-24-2013, 09:32 PM   #4
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No fan shroud, but would that have an effect at highway speed.
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289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.
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Old 08-24-2013, 09:37 PM   #5
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I don't think it would that much at highway speeds, but in traffic and hot days its made a difference for mine. We actually fabricated a shroud ourselves for this year until I buy a complete kit. Dual fans and rad kit. Something better for racing since I started lapping the car this year. But for now the McGyver setup is working just fine.
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Old 08-24-2013, 09:46 PM   #6
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I think it would
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Old 08-24-2013, 10:06 PM   #7
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You think it would on the highway? I think every bit helps I guess, but usually you'll see over heating in traffic, congestion and hot temperatures or all of the above at once! Lol.

All I know is that a shroud is a must. Cheap and like I said you could make your own for little $$.
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Old 08-24-2013, 10:22 PM   #8
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Very true but i think that the fan would be sucking more air through with the shroud on at higher speeds
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Old 08-25-2013, 07:58 PM   #9
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Update: Adjusted timing, it was at 3, now at 12. Changed thermostat. It runs at about 190 on highway and starts to hear up at lights. So fans shroud it is. I'll order one tomorrow. Thanks for the input.
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289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.
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Old 08-25-2013, 08:07 PM   #10
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Nice, always good to see someone find a positive solution. Give us news.
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