My car came with a cold case alum g body radiator. Aluminum shroud didn't fit the core well, and I spent 3 hrs. fitting it like it should have been from the factory.
The main issue was the fans were installed as pull thru, but the blades were for a pusher setup. It blew the air FOWARD out the front of the radiator!!!
OK I figured, I'll just swap the positive and negative wires, didn't work worth a crap, as the curved blades didn't work efficiently pulling backwards.
The solution was to make adaptors on my lathe so that the blades would fit the shafts spaced correctly and not hit the radiator or fan housing. THEN I noticed how much casting flash was on the blades and "finger guard" grille.
After another 2+ hours of die grinding and removing every other "finger guard" rail, I had fans that instead of pulling 7.8 MPH air thru the radiator, finally pulled 21.8 MPH air thru it. Damn near 3 times the airflow and much less noise too!
The only reason I spent the time was that setup was new on the car, and I figured it was there, so, polish the dog turd, and have a usable part.
If you are going to check out Cold Case you might want to make sure they have that little issue figured out, before you buy!
A few more thoughts about electric fans: if the fans are on and the car is going 40 MPH, and the fans are blowing at 7.8 MPH, they will slow down the air thru the radiator! AND, why the HELL are there "finger guard" grilles with the slats so close together even a baby's fingers can't get in there?
What? A baby is gonna open the hood and run alongside the car and stick his fingers in there?
Water pump mounted mechanical fans don't have guards, why do electric fans?
On most fans you can cut out 2 out of 3 rails and net more airflow, I have been doing this for 30 plus years!
A small Harbor freight $25.00 air body saw works great!
Yes, I am that anal about everything I do!
And I have a wind meter, among other odd ball meters and such, so I know what is happening!
I can't think of many parts on my car that I haven't modified and improved before their installation. I'm proud of the results!
TIMINATOR
YEAH, AND I POLISHED THE SHROUD, AND INSTALLED HEAT SHRINK ON THE WIRES TOO!