66 BB fan shroud? - Impala Tech
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View Poll Results: factory shroud or not
if car had air, it had shroud 1 100.00%
wrong radiator 0 0%
depends on where car was shipped to originally 0 0%
depends on where car was manufactured 0 0%
Multiple Choice Poll. Voters: 1. You may not vote on this poll

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post #1 of 8 (permalink) Old 07-29-2007, 01:35 PM Thread Starter
Join Date: Mar 2007
Location: minnesota
Posts: 5
Unhappy 66 BB fan shroud?

Hey, I own a 66 impala 396 automatic car w/out air. The harrison radiator ( not a 4 core) looks original but doesnt have a shroud or the tabs to mount one. I've been told some did some didnt. This car only over heats while sitting in traffic, and leaves a nice puddle when u stop.
NOTE; radiatorhas been checked, system flushed including heater core, new thermostat and new waterpump put on.
Should this car have a shroud?
chris is offline  
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post #2 of 8 (permalink) Old 07-29-2007, 06:19 PM
Join Date: Jan 2006
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This is from memory so I may be off here; originally the BBC shipped with a three core radiator which was upgraded to a four core with air unless it was ordered with HD cooling. After 1969 all BBC cars had a four core radiator with or without air because the factory and learned that the three core had problems keeping it s cool. It should have shipped with a five blade without a shroud or a seven blade with shroud and a fluid coupled fan clutch as well with the four core.

Unless this is a restoration I recommend an aluminum two core (with 1-1/4" wide tubes) with a fan shroud, seven blade mechanical fan controlled by a new thermostatic fan clutch, and a 160° Stant style (Mr. Gasket) thermostat running antifreeze deionized water. You can keep up to 600 cubes cool with this set up.

Big Dave
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post #3 of 8 (permalink) Old 09-27-2008, 02:21 AM
Join Date: Sep 2008
Location: greenville tx.
Posts: 13

all 66 's had a shroud and i believe plastic. if cluth fan is good shroud
should fix problem. maybe wrong raditor though,keith
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post #4 of 8 (permalink) Old 10-01-2008, 09:03 AM
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All cars came with a shroud
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post #5 of 8 (permalink) Old 07-26-2011, 07:36 AM
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If AC or HD Cooling came with shroud and 5 blade fan and clutch, else came with 4 blade fix fan and finger guard. Early 66 came with metal fan shroud and later production came with a plastic shroud.
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post #6 of 8 (permalink) Old 07-26-2011, 10:44 PM
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Over heating

As Paul stated, all cars did not come with clutch fans or shrouds. The standard fan is a 4 blade with a finger guard. If you had the optional C60 A/C or C75 Comfortron, it included the heavy duty clutch 5 blade fan and shroud. You could have also ordered the Heavy duty fan as an independent option, RPO K02, however the shroud was not included as part of this option.
You may want to double check your timing and also try a 160 thermostat if you currently have a 180, if that does not work and you want to keep original, go with the optional heavy duty 5 blade fan from any A/C car.



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post #7 of 8 (permalink) Old 07-27-2011, 09:56 AM
Join Date: Jan 2006
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In 1969 Chevy changed their policy on their fans and radiators in response to customer complaints. They included the heavy duty cooling option any time you ordered a big block: so you got a four core radiator, and a seven blade fan with a fluid clutch (not necessarily thermally controlled that was only used on high performance cars). So even thought it is isn't concours correct; if you are buying a new radiator and fan and shroud I would choose the largest radiator and fan I could to keep the car cool, especially with air conditioning.

Big Dave
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post #8 of 8 (permalink) Old 08-01-2011, 12:03 AM
Join Date: Aug 2010
Location: Canada
Posts: 65
In my opinion, the aluminum radiators are junk. Talk to Jim at U.S. Radiators... he is building my four core this week. I chose the "High Eficency" model for my '65. These rads look dead stock and fit right.

I will be cooling my 489 cube, stroked Gen VI with 10.25 bump pistons and 781 iron heads. We ran it on my machine shops dyno last month and made 596.4 ft. lbs. @ 3300 and 550.1 hp @ 5400. The curve was long and we pulled it to 6400 before she started to fall off. That is wicked for an iron headed street engine and they have a very conservative dyno... these guys build 1500 hp race engines steady and rarely do a street engine, they know what's what.

Even they say most aluminum rads are garbage, Griffin, Be Cool, etc. The aluminum rad they did say was good was a brand I had never heard of and can't remember but it was almost $1000. With a 160 thermostat and a shroud, I will be fine. My friend has a Be Cool in his 396 Nova and he has trouble with it and it didn't fit worth a damn.

Good luck with your car...

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