[Squidward]

I put in a 4 core Champion, and it helped with cooling. I'm not sure, tho, that I still don't have air flow issues with my electric. I want to go with a mechanical clutch fan and shroud. It looks better, and will simplify my electric system.

I live in AZ, which turns into Satan's flaming anus during the summer. I will need max cool capability.

I've heard of people using various HD late model clutches. And concerning fans... what mech fan? 17"? 19"?

I looked at the OER shrouds for 67 FB's, and the reviews were BAD. Any recommendations for fit/finish?

Thx!

[ponyakr]

I assume that more blades mean more airflow. So, since you need max airflow, I'd go with a 7 blade, in the biggest diameter that will fit in the shroud you'll be using. And of course, you can get either solid hub or clutch type.

I assume that the solid hub flex fans are much lighter than the clutch type. So, an 18", like the Flex-a-Lite, should work. They do make a lot of noise. My neighbor has offered to give me his 6 blade flex, because it make so much noise. But you need to be real careful when working with or around these metal flex fans. The blades have some real sharp edges that will cut you easily. This one got a 5 star rating at Summit.

http://www.summitracing.com/parts/flx-1818

http://www.summitracing.com/search/d...rder=Ascending

Or, here's a HD 6-blade that's rated to 10,000 rpm.

http://mudflaps.com/i-8123062-derale...61LRoCbcbw_wcB

If you prefer a clutch type, here's some fans and a severe duty clutch.

http://www.ebay.com/bhp/7-blade-fan

http://www.amazon.com/Hayden-Automot.../dp/B000C3F3D4

http://www.ebay.com/itm/Engine-Cooli...25.m3641.l6368

http://www.haydenauto.com/Installati...s/Content.aspx

[ponyakr]

Don't know if the Goodmark shroud is any better than the OER or not ?

http://www.classicdiscountparts.com/...-Firebird.html

http://www.summitracing.com/parts/gmk-4320-310-67

You've probably already seen these high dollar shrouds.

http://www.classicindustries.com/pro...rts/g9057.html

https://www.npdlink.com/store/produc...0275-1820.html

http://www.firebirdcentral.com/1967_...p/rad-2817.htm

If you don't wanna take a chance on a plastic shroud, there are some universal metal shroud kits. These require some fabrication, but will allow you to use a 19" fan if you'd like, and you can locate the hole exactly where you want it.

Not for everybody, but will work for some, who are not that concerned with the original look.

http://www.speedwaymotors.com/Alumin...Fan,17143.html

[silverbullet07]

Doesn't the 19" flex fan cool better then the clutch fan? I thought I have read that somewhere.

Will the GM shroud fit the core Champion? I would choose it if it does.

[TheSilverBuick]

Can't beat a 7 blade clutch fan with a full fan shroud.

My old '69 Firebird had the OE 7 blade and clutch fan with shroud (an A/C car) with a 3-core radiator and in southern California and Las Vegas heat and traffic it always held the thermostat temp, even for the short period I ran a 160ºF thermostat (I prefer the 180-185º ones). My Buick Centurion and Skylark with a 455's have the same OE setup and never an issue in traffic and triple digit outside temps.

[68azbird]

Squid
You know what I got and you know it works great.

[Region Warrior]

Found a chart online years ago somewhere?...
Had no idea how confusing it could be. Hope posted correct. Work keeps interfering!

67 V8 HD exc AC: 5 blade 19" diameter 2-1/4" pitch.
67 400 exc AC, RA: 7 blade 19.5" 1-7/8" pitch.
67-69 V8 w/AC: 7 blade 19.5" 2-1/4" pitch(thermo clutch).
68-69 exc AC, HD, RA: 5 blade 19"/2-3/16" pitch(power flex).
69 V8 HD: 7 blade 19" 2-1/2" pitch(power flex).

I've had equally good cooling results back in the 70-80s with factory 7 blade 19.5" clutch and a 7 blade 19.5" Flexalite(same size blades as factory - not the skinny types) since the late 90's.
Wouldnt go less the 19".Be sure to use the factory shroud with either.

[Squidward]

Originally Posted by 68azbird

Squid
You know what I got and you know it works great.

Ya, I was gonna call u in the morning, but u know I like to start conversation.

[RAJ7395]

Squid- Make sure you've got a good water pump and not one with a POS stamped impeller. I'd also put water wetter in the coolant to reduce surface tension and promote better heat transfer.

[tom s]

Stock 350 auto radiator.stock shroud,stock 19 blade no clutch,factory 11 bolt pump NO issue with over heating.Tom

[69Farburd]

On my 69 with AC, I use the stock fan with thermo clutch and fan shroud. It gets hot (and humid) here in Texas too. I did install a Rodney Red aluminum radiator and it made a big difference. Also, do a search for a mod to the water pump divider plate that moves the plate closer to the vanes in the wp and increases the amount of coolant being circulated.

[Squidward]

I've already done all of the pump mods. I am running a Taurus electric fan.

I've suspected an air flow issue for a while. The electric would cool forever at idle with the ac running at 100+ temps outside, and never get over 180. Cruise would be an issue. The bigger rad helped, but it is still not where I want it. When I can keep it at 180 forever, below a tstat temp setpoint, then I will be satisfied.

I want to go back to basics. I will do a hd clutch and 19" fan with stock shroud.

I'm gonna try a stock shroud, and see if it fits ok. I have no hangup on original appearance, tho.

[400 4spd.]

Originally Posted by 69Farburd

On my 69 with AC, I use the stock fan with thermo clutch and fan shroud. It gets hot (and humid) here in Texas too. I did install a Rodney Red aluminum radiator and it made a big difference. Also, do a search for a mod to the water pump divider plate that moves the plate closer to the vanes in the wp and increases the amount of coolant being circulated.

Is Rodney Red still in business?

[Squidward]

Originally Posted by 69Farburd

On my 69 with AC, I use the stock fan with thermo clutch and fan shroud. It gets hot (and humid) here in Texas too. I did install a Rodney Red aluminum radiator and it made a big difference. Also, do a search for a mod to the water pump divider plate that moves the plate closer to the vanes in the wp and increases the amount of coolant being circulated.

I was flushing it today, and with the engine idling it pumped the water out as fast as the hose could fill it. I think the water flow is ok. I'm running a small diameter wp pulley.

[68400BIRD]

You could be moving the water to fast with the small pulley.
I just installed a shroud on a Champion radiator.
It mounts fine on top. The bottom is a different story.
The bracket on the bottom of the Champion radiator is that, just a bracket.
I drilled and tapped three 3/8-16 holes. I used short screw with fender washers and some Loctite.
Worked out great.

[TheSilverBuick]

Unless the pump is cavitating, there is no such thing as too fast. All heat transfer systems increase in efficiency/heat transfer with faster flow.

More heat out of the engine and more cool water into the engine. If the radiator isn't cooling the water sufficiently, then it's either does not have adequate air flowing through it (usually no or poor fan shrouding) or the radiator is simply too small (or plugging up..)

[Region Warrior]

A shroud helps a lot with E-fans too.
On the fence about cant have to much flow.
Just have 19-15/16 flex, Rodney rad., factory shroud, non a/c pulleys, 180 stat. Didnt get over 195 sitting staging lanes during 90's degree weather. I sure did sweat waiting to run though!
Do some testing with a/c pulleys along with upper, lower, and side baffles when it's back together.

Edit;

Oh ya, water pump has stamped steel impellar....

[quicksilver97ta]

Get a Hayden SEVERE duty clutch. I run that, repop shroud, OE fan, and I block anywhere and everywhere the air could get around the radiator or shroud with foam insulation. I dont have those original masticated pieces but I fabbed up some black plastic block-offs to replace them. Oh, and the upper and lower sheet metal baffles of course. Results are excellent, typically with-in your wish list (maybe 185) at least until I turn the A/C on but I do run a true 10.5:1 with iron heads. Ahh, and dont forget to use some vacuum advance, it helps.

[Squidward]

Originally Posted by ponyakr

Don't know if the Goodmark shroud is any better than the OER or not ?

http://www.classicdiscountparts.com/...-Firebird.html

http://www.summitracing.com/parts/gmk-4320-310-67

You've probably already seen these high dollar shrouds.

http://www.classicindustries.com/pro...rts/g9057.html

https://www.npdlink.com/store/produc...0275-1820.html

http://www.firebirdcentral.com/1967_...p/rad-2817.htm

If you don't wanna take a chance on a plastic shroud, there are some universal metal shroud kits. These require some fabrication, but will allow you to use a 19" fan if you'd like, and you can locate the hole exactly where you want it.

Not for everybody, but will work for some, who are not that concerned with the original look.

http://www.speedwaymotors.com/Alumin...Fan,17143.html

Thanks for the links. I ordered the Goodmark shroud. The OER shroud reviews pretty much stated "POS". Ames even lists it as "poor to fair". I will be using a factory style 19" steel fan, Hayden 2797 HD clutch, and some Water Wetter. I just pressed the magic buttons, so it should arrive in a few days for install.

This last weekend I flushed my entire cooling system. I've had a problem with the growth of some fine rust sludge/paste. I added a few cups of white vinegar to the water and let that circulate around for a while, and it cleaned stuff up considerably. Lots more flushing, and no brown. And the radiator no longer smells like pennies and dirty feet.

Crossing fingers for super cooling and summer a/c!

[Squidward]

Originally Posted by quicksilver97ta

Get a Hayden SEVERE duty clutch. I run that, repop shroud, OE fan, and I block anywhere and everywhere the air could get around the radiator or shroud with foam insulation. I dont have those original masticated pieces but I fabbed up some black plastic block-offs to replace them. Oh, and the upper and lower sheet metal baffles of course. Results are excellent, typically with-in your wish list (maybe 185) at least until I turn the A/C on but I do run a true 10.5:1 with iron heads. Ahh, and dont forget to use some vacuum advance, it helps.

I installed the upper rad support baffles, and started fabbing a lower valence baffle. I will also consider some side baffles.

If nothing else, the upper baffles make for a cleaner underhood appearance!