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So I've been asked to put my car in a parade this spring and I want to take steps to make sure I don't have any problems. It is a 69 Z11 SS350 4-speed that is effectively stock: 4 blade belt driven fan and (I think) a 2 core radiator. Normally I don't have any real cooling issues: it will occasionally puke up some coolant but as long as I keep it about 2 inches low it's normally fine or just a dribble and it has never overheated, but if in traffic or right after I pull off the highway the temperature will rise to the point I start to get nervous. Never boiled over though...

So I plan to leave it in the stock configuration, put would like to supplement the cooling system some, at least for the parade. I've got an overflow bottle to put on it just to keep it from dribbling on the parade route and am considering adding a pusher fan just to make sure it gets enough air when going slow during the parade. The radiators on these cars aren't very big, it looks like the biggest fan I can put on it is about a 14" fan, but I've also wondered if a 5.2" one like might be on a ATV would be enough? I'm wondering if a bigger fan would block air flow to the point I'd have to use the fan, whereas a smaller one may allow me just to run it when needed, meaning less, and would take away less from the stock appearance of the car. No objection to the bigger fan, just not sure if I need all that...

Thoughts or experiences?
 

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I wouldn't add another fan it may restrict the air to your regular fan, get a bottle of royal purple antifreeze additive. it is supposed to cool 25* cooler lucas also makes an additive that I have used and swear by. keep at least 1/2 car length between you and the car in front to keep from drawing in their exhaust and heat. OR put in on a trailer and have no worries at all>:):grin2:
 

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Ditch the 4 blade fan for a 7 blade clutch fan.
 

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Congrats! Parade speeds are LOW, I have to keep riding the brake with my auto during parades. With a 4 speed, your left leg is going to get a work out! The walkers stop and start a lot. Then the cars are doing all these stops and starts to keep from running into them (while trying to wave), much more difficult then you think :)

So report back on your experiences, I will have my car in the local St. Patrick's parade on the 24th.
 

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The clutch would be my concern too, that's why I don't do our annual graffiti night parade. 2 hours of riding the clutch don't sound like fun.

I would think your stock cooling system should work, maybe pull the radiator and have a shop "rod it out" if you think it's time for it's 50yr cleaning, or at least a good flushing out.
 

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OP... if you do decide to go the fan clutch/7 blade fan route, I have a brand new Hayden fan clutch and 7 blade stock appearance fan. Never installed as I went with a Griffin radiator with electric fans... summit part numbers HDA-2705 and FLX-5718... pm if your interested
 

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Not sure about the '69's, but I've got a '67 350 4-speed, basically stock with mild isky cam, hi rise etc, long tube headers and it's been through several parades with no issues. I've never had it overheat. I use the stock 4 bladed steel fan with factory shroud.
 
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