Radiator & Fan Blade for BB 67 - Impala Tech
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post #1 of 14 (permalink) Old 01-17-2010, 08:52 PM Thread Starter
 
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Question Radiator & Fan Blade for BB 67

Hi,
Anyone know for sure what size radiator/core and number of blades on fan the BB A/C cars came out with in 1967 Impala SS's??
Thanks,
Michael
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post #2 of 14 (permalink) Old 01-17-2010, 09:26 PM
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Fan was a seven blade with a viscous fluid clutch. The radiator was a four core brass and copper 19" x 28.5" (24.5" wide (or tall) core measuring inside the tanks.

Big Dave
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post #3 of 14 (permalink) Old 01-17-2010, 09:43 PM Thread Starter
 
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Thankyou for the quick reply.

Michael
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post #4 of 14 (permalink) Old 01-17-2010, 11:46 PM Thread Starter
 
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Dave,

Would you have a picture clearly showing the radiator and shroud in the car?? Is a four core radiator from a 65/66 different to a 67??

Thanks,
Michael
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post #5 of 14 (permalink) Old 06-09-2012, 12:16 PM
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67 Impala SS w/ AC and 396Ci

Any suggestioins on best place to buy a 7 blade fan to be used with a fan clutch? Need not be OEM. Thanks Bob
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post #6 of 14 (permalink) Old 06-09-2012, 12:29 PM
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Actually, the '67 BB cars came with a 5 blade fan and a 2 core radiator, even with AC. I know that it's a little hard to believe. The 7 blade fan started in '68. There was an optional 3 core radiator that is distinguishable because the cap is offset to the passenger side. Beginning in '66, the top radiator hose was located on the drivers side. '65 was a one year only radiator with the top hose on the passenger side.

Mike

1965 Impala SS 396
1967 SS427
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post #7 of 14 (permalink) Old 06-09-2012, 12:39 PM
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1967 Impala SS with AC and 396ci

Mike, thanks for the quick reply. Looking for a 7 blade fan re: just converted to a R134 system. The AC folks suggested I go with a 7 blade fan re: need to move more air re: higher head pressure. I am not an AC "expert" so just trying to follow the AC folk's suggestion. Thanks again, Bob
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post #8 of 14 (permalink) Old 06-09-2012, 02:36 PM
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Do a search on eBay for GM 3947772. That's the 7 blade GM clutch fan you want...
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post #9 of 14 (permalink) Old 06-09-2012, 03:15 PM
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67 Impala SS with AC 7 blade fan

Thanks for the feedback. Bob
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post #10 of 14 (permalink) Old 06-09-2012, 03:58 PM
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I also recommend a thermostatically controlled fluid coupler. That way it doesn't draw any horsepower to turn the fan unless the motor heats up at idle. The coupler senses the temp increase off of the radiator and locks up drawing air through the radiator. Advantages include it moves more air than an electric fan can think of moving, weighs less, costs less, and looks original.

I use a Flex-lite 5718 seven blade fan (rated at 4,000 max RPM), and a Flex-lite 5557 Standard Duty Thermostatic controlled fan clutch (because I have a 1985 car; Your's might take a 5537 which fits the earlier model Chevy's). The fluid coupler by the way turns at one third engine rpm when cold 1:1 when hot so watch the maximum RPM when temps are up. If you are going to race it a lot consider a race fan that the blades flatten out as RPM increase such as the Flex-Lite 1380 which is good to 10,000 RPM (just keep in mind a Race Fan isn't intended for the street, just keeping the car for boiling to the ground during a pit stop).

Big Dave
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post #11 of 14 (permalink) Old 06-09-2012, 05:14 PM
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67 Impala SS w/AC 7 Blade Fan

Big Dave, thanks and great info. Never thought about the RPM rating. I will not be racing but exeeding 4000RPM on the street is quite possible. Are the OEM blades rated at 4000RPM or higher? Thanks again, Bob
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post #12 of 14 (permalink) Old 06-09-2012, 07:59 PM
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Nope they were all the same.

Generally the fan clutch slips unless the coolant is really hot allowing the motor to far exceed the fan's rated speed. However there is one other time that it sticks like glue locking the fan blade to crank speed. That is when it is stone cold, and you first crank up the car. Until the PlayDoh locked inside the clutch warms up enough to go from semi-solid putty to liquid it can over drive the fan, as a moderator on another board I share discovered; sending fan blades through the hood and fenders of the car (it even made an appreciable dent in one of the frame horns of the car).

Like I said I use those products and have for years. Once warmed up the fan easily spins to 6,800 which is where my cam rolls over and dies in the 582. I have one on my 406 and it has been to 8,700 RPM a number of times (I have a more aggressive solid roller cam with better heads in the small block).

Big Dave
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post #13 of 14 (permalink) Old 06-09-2012, 09:40 PM
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67 Impala SS w/AC fan blade

Thanks again for the info. Bob
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post #14 of 14 (permalink) Old 06-15-2012, 01:54 AM
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I had a hell of a time finding the proper radiator when I swapped the big block into my '67. I ended up with Spectra #CU289, which is a 3 core rad that fits reasonably well.
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