1966 Rad options with electric fan - Impala Tech
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post #1 of 5 (permalink) Old 03-06-2020, 08:52 AM Thread Starter
Join Date: Nov 2017
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1966 Rad options with electric fan

Any help would be great. looking to put a new rad in with electric fans. BB 496
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post #2 of 5 (permalink) Old 03-06-2020, 10:43 AM
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You can add electric fans to any radiator as they are sold separately. If you are going to go that route which I advise against it. Use new SPAL brand fans as they are the manufacturer that FOMOCO uses as an OME, so they will be reliable in operation. if not in cooling. Electric fans don't move as much air as the stock mechanical fan does (seven blades, eighteen inches in diameter). They are limited by the fan's electric motor.

I prefer an aluminum Griffin twin row if you want it to look stock when painted black.

1966 - 1967 Chevelle Aluminum Radiator

Be-Cool offers a direct fit for double the price of Griffin, but their fabricated tanks won't look stock.


Then there is Cold Case a new company I have never heard of that offers a Chevelle radiator saying it will fit a full size:


It will fit in the car but it is smaller than the factory copper brass radiator, and because it is made of aluminum it won't cool as well.

Though looking at the direct replacement radiator from Rook Auto (sized for a 327, not a 427 so it is already missing a row of tubes) it is the same size as the Cold Case above.


You can not have a radiator that is too big (the thermostat will prevent it falling below operating temperature). I size my radiators out of light trucks as that is the largest radiator based upon core size made that I can stuff under a hood (it requires fabricating a different mount). I often call up Griffin for a custom fabricated radiator with three cores instead of two as I build my motors as large in displacement as I can (582-632 cubes) which produces a lot more heat than a stock engine.

Remember your radiator must shed one third of the heat in BTU,s that your engine makes in horsepower.

Convert horsepower to btu per hour | power conversion

Big Dave

Last edited by Big Dave; 03-07-2020 at 09:24 AM. Reason: in need of an edit
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post #3 of 5 (permalink) Old 03-07-2020, 08:34 AM Thread Starter
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Thanks Dave
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post #4 of 5 (permalink) Old 03-13-2020, 09:49 AM
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A modern aluminum radiator does not actually have to be as thick or have as many rows as the old copper brass ones did to do the job. Aluminum dissipates heat faster, Dave is right about not really being able to go too big with a radiator. But at some point you’re just throwing money at it. Serape also makes good electric fans, as do a few others. You hint have to go buy the most expensive fans just because a manufacturer has that company in their pocket.
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post #5 of 5 (permalink) Old 03-13-2020, 09:52 AM
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Derale is what I meant , not serape not sure why my phone changed it to that at all
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