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Old 07-12-2021, 07:08 PM
Bobs66gto Bobs66gto is offline
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Default aluminum radiators

looking for advice on a radiator and electric fans for a 66 gto
461 5 speed vintage air not sure what everyone is using need help
thanks

bob

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Old 07-12-2021, 07:47 PM
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Cold Case w clutch fan

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Old 07-12-2021, 08:24 PM
gtospieg gtospieg is offline
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x2 on Cold Case

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Old 07-12-2021, 09:02 PM
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Quote:
Originally Posted by Bobs66gto View Post
looking for advice on a radiator and electric fans for a 66 gto
461 5 speed vintage air not sure what everyone is using need help
thanks
bob
I would suggest an American Eagle that has two 1" cores from these guys:

https://www.championradiators.com/American-Eagle-Pontiac-GTO-radiators-shrouds-1965-1966

They will also make a custom aluminum shroud for you. I'd suggest dual 12" electric fans and I would go with Spal for those. They sell Spal fans but you might be able to find them cheaper someplace else.

Do you have plans on how you want to control your fans yet? I'd suggest setting the fans up with a 3-relay circuit for 2 speed operation. Low speed runs the fans in series and full speed runs them in parallel. Dakota makes a good stand alone controller for this setup. Part# PAC-2750.

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Old 07-12-2021, 11:20 PM
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Quote:
Originally Posted by OCMDGTO View Post
Cold Case w clutch fan
+1 to this. Don't bother with electric fans. Not necessary.

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Old 07-12-2021, 11:32 PM
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Cold Case 1 1/4 tube, forget electric fans use the factory shroud with a good clutch fan, works great on my 571 cu.

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Old 07-13-2021, 06:57 AM
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I didn't realize the Cold Case had two 1.25" cores. That does make it more desirable than the American Eagle I recommended.
Do you guys that prefer to stay with a clutch fan use severe duty clutches like the Hayden 2797?

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2019 BMW 440ix - Twin turbo I6, 8spd auto. PHOTO
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Old 07-13-2021, 07:38 AM
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Quote:
Originally Posted by GTO JONES View Post
Cold Case 1 1/4 tube, forget electric fans use the factory shroud with a good clutch fan, works great on my 571 cu.
I assume this is your son.
Pretty compelling to not go with a Cold Case electric fan shroud.

https://forums.maxperformanceinc.com...d.php?t=830680

1/4" is not enough distance between the shroud and core for sure. They should redesign this and space it out. However, the performance you got using a clutch fan and stock shroud in the hot AZ summers makes a strong case for going that route.

You have changed the direction I was planning on for my '69 GTO radiator setup.

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2019 BMW 440ix - Twin turbo I6, 8spd auto. PHOTO
'55 Chevy Bel Air Sport Coupe - Ram Jet 350 / T56 Magnum 6spd, Restomod Completed Sept. 2012, Sold Sept. 2021 PHOTO
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Old 07-13-2021, 09:36 AM
RFCOLEMAN RFCOLEMAN is offline
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Cold Case with factory fan and fan shroud works well for me. 455 4 sp. 3:90 rear.

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Old 07-13-2021, 11:09 AM
tjs72lemans tjs72lemans is offline
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I agree with the Cold Case and clutch fan. Works consistently well.

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Old 07-13-2021, 11:11 AM
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Quote:
Originally Posted by roger1 View Post
I assume this is your son.
Pretty compelling to not go with a Cold Case electric fan shroud.

https://forums.maxperformanceinc.com...d.php?t=830680

1/4" is not enough distance between the shroud and core for sure. They should redesign this and space it out. However, the performance you got using a clutch fan and stock shroud in the hot AZ summers makes a strong case for going that route.

You have changed the direction I was planning on for my '69 GTO radiator setup.

Yeah that's my son. We tinker a lot.

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Old 07-13-2021, 04:44 PM
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GTO Jones & Formula, what clutch are you using? Just noticed a wobble in mine and ordered a standard centrifugal one from NAPA today, coincidently.

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Old 07-13-2021, 05:08 PM
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Quote:
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GTO Jones & Formula, what clutch are you using? Just noticed a wobble in mine and ordered a standard centrifugal one from NAPA today, coincidently.
When I did mine I got Hayden HD for a pickup truck, don't know what the part number is off hand.

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Old 07-13-2021, 05:35 PM
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Hayden explains about their fan clutches here:
https://www.haydenauto.com/en/techni...q-fan-clutches

The part number for their standard duty is 2705, heavy duty is 2747 and severe duty is 2797.

Pretty sure Hayden makes fan clutches for Napa.

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'83 Chevy Choo Choo SS El Camino - LT1 350/4L60e, Owned for 30 Years, completed 2nd restomod in 2018 PHOTO
2019 BMW 440ix - Twin turbo I6, 8spd auto. PHOTO
'55 Chevy Bel Air Sport Coupe - Ram Jet 350 / T56 Magnum 6spd, Restomod Completed Sept. 2012, Sold Sept. 2021 PHOTO
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Old 07-13-2021, 06:35 PM
Bobs66gto Bobs66gto is offline
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Quote:
Originally Posted by OCMDGTO View Post
Cold Case w clutch fan
What size fan did you use thanks

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Old 07-13-2021, 08:05 PM
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Old 07-13-2021, 08:33 PM
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Bob, I have a 7 blade/19" fan that came with the car when I got it w stock shroud. Jeff/455, you keep that car clean as hell

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69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60'
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Old 07-15-2021, 05:56 PM
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I would use the 1.25 inch tube unit if you can. I have 3 different brands on 3 different types of cars and they all work well. My radiator that came with the aluminum shroud and 2 fans worked cooler when I removed the shroud. I’ve found that if you can fit one large fan, either clutch or electric, it will cool better than 2 smaller ones. Good luck

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Old 07-16-2021, 10:05 PM
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Don't forget that Cold Case has two product lines for the 64-67 GTO. There's the dual 1" line with more original looking tanks for owners who want that OEM look and there's the dual 1 1/4" HO/SD rads for those with maximum performance applications and less concern about originality. For example, if you have a tripower 4 speed car, you can get the OEM style rad that has the filler, inlet and outlet all in the correct spot for all years 64-67. The HO/SD rads are pretty simple. You can pick from 64-67 non AC and 64-67 AC. No choice for MT nor 64-65 specific options are available.

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