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PostPosted: Fri Jul 23, 2004 4:44 pm 
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Location: Copperas Cove, Texas
My stock hood is not the best in the world and getting worse by the day. I will eventually replace it with a fiberglass hood and i have some concerns. With cowl induction, will the steepness of the windsheild cause problems with this effect. Is there a way to reverse the concept? The biggest reason for wanting a cowl type hood is that i want to pull air out from under the hood. With the V-8/radiator setup i have now, much of the forward support is removed. Lots of air can travel over the top of the radiator in to the engine compartment. I can only think that if i stop the air flow over the radiator, more air WILL pass thru the cores. And if i can get the cowl type hood to pull air out from the engine compartment, the better off the motor will be. Does this make sense? Or does the design of a cowl induction hood keep this from being possible?

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
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What do Water, Electricity and Humans have in common... They all travel the path of least resistance.


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PostPosted: Sat Jul 24, 2004 6:32 am 
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Not sure about the windshield being too steep. I guess if your vents work in the cab, ie blows air faster the faster you go, I'd guess the cowl hood would be working too. Don't think you can reverse the effect to pull air out.
If you want more air through the radiator I think you'd need to seal up some of the gaps and funnel the air into it.
Are you having a problem with the temp?

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PostPosted: Sat Jul 24, 2004 8:52 am 
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With the mod to install the radiator i have right now, the center section of the support is cut out along with the hinges and the panel between the 2 hinges. The panel would have stopped air flow trying to go over the top of the radiator support. Without the panel, air can easily flow over top between the radiator and the hood. There's a 1" X 28" gap that air can flow in to the engine compartment with out going thru the cores of the radiator. There are other places that will allow air in to the engine compartment but they are rather insignificant but this has to cause a negative effect. If there's air entering the engine bay, the radiator isn't as efficient as it could be. Plus it's bad enough trying to get rid of the heated air thats already there. The V-8 takes up alot of space so i want to get as much air thru the radiator. The repair i would like to make would be to replace the entire forward support and properly install a 19" x 22" aluminum radiator. This will allow for the hinges and the panel on to mention that the support would be solid again.
Now getting rid of the hot air... As i said, my stock hood is needing replacement and i would like to get a Cowl induction type hood. The motor doesn't need the added clearance of a cowl, but i'll have some room to play with in the future if need be. With the design of the new hood, this will cancel out the repair at the radiator/hood gap. Unless i build everything to have a fully functional induction system or close off the end of the cowl. I was wondering if it was possible to utilize the cowl somehow to remove hot air from the engine bay.
As of now, the truck isn't doing too bad with engine temp but i feel that the setup right now is barely adequate. Im looking at every way to keep this motor cool.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.


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PostPosted: Sat Jul 24, 2004 5:01 pm 
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the cowl might help you stay cooler in a couple of ways.at stop lights and very low cruise speed .the hole at the back could allow it to vent the engine heat out the top since heat rises. it would go out the opening in the hood easier than out the fenderwell openings, or around the bottom of the fire wall. now if the after market cowls actually work and at medium to high speed the air off the windshield is forced in.that could still benefit you because it would help force some of the hot air in the engine bay under the truck.another thing you could do is make the cowl so it is functional.another words build you a tray for your air breather to seal up against the bottom of the hood.the only air the carb would see would be directly from the cowl. that air would be cooler than what it`s breathing under the hood and then you would get the ram air effect at speed. without putting extra air into the engine bay. i guess i`ll shut up now that i`ve rambled enough. later

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PostPosted: Sat Jul 24, 2004 6:19 pm 
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Blue, I would definitely get an aluminum radiator. Actually a griffin 19x22 is what is in my truck. I cools pretty well, I've seen it hit 210 once when I forgot to turn the fan on. I didn't think about the cowl for low speed and stopped heat dissipation. I couldn't tell the difference between my cowl hood and the regular hood though.

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PostPosted: Sat Jul 24, 2004 6:31 pm 
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Are you running the stock inner fenderwells. I haven't done anything to mine except pulling the rubber skirting off. Plus the cut out for the #8 header pipe. The radiator i have right now is a standard, 4 core unit that worked fantastic with the Buick V-6. Buicks are prone to run hot and the SB V-8 has 148 more c.i.d.
For years i lived with major overheating issues and i want to explore every way to avoid problems with the 400.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.


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PostPosted: Sat Jul 24, 2004 6:40 pm 
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Yeah, same here just the skirting is gone. I have manifolds on mine at the moment so there is no cutout.

Same in the truck I had with a 283, only with a radiator like you have now. The only time I had a heat problem with it was when a couple of freeze plugs developed holes and the solder on the upper rad neck broke loose.
Then again this isn't like the heat where you're at.(I remember it well!)

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PostPosted: Sat Jul 24, 2004 6:51 pm 
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I've been fortunate so far this year with the heat. Only one 100+ day. But if gets that warm out, i'll drive the 1500 with the a/c running wide open.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.


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PostPosted: Sun Jul 25, 2004 2:33 pm 
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http://www.syty.org/archives/syty/0002/msg00678.html

I found this webpage on cowl induction. They state that with all of the correct components installed to have a functional cowl induction system, clean, cooler air will be fed to the carb. If just the hood is cowl inducted without the other components, hot air from the engine compartment will travel out from the cowl.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.


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PostPosted: Sun Jul 25, 2004 8:06 pm 
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I guess that answers it! :D

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PostPosted: Sun Jul 25, 2004 9:56 pm 
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so either way good benefit you. i would say throw one on and watch your temp gauge with out it being functional.it may drop your temps a few more degrees. if not make it functional and that may help reduce pinging on hot days under a load.because it would lower your incoming air temp.

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don`t have the luv no more but I still like em.72 el camino,
00 & 06 silverado one 4x4, turboed vw sandrail,99 banshee, 06 raptor 700, 02 polaris trailblazer.


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