Chevelle Tech - View Single Post - Simple cooling improvement
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post #5 of (permalink) Old Aug 13th, 19, 5:55 PM
Tech Team
Join Date: Jan 2011
Location: Los Angeles
Posts: 313
Re: Simple cooling improvement

Originally Posted by suntreemcanic View Post
My 66 chevelle, 396, 360 HP, powerglide, 4 blade fan, factory shroud and original radiator ran 190 degrees on the open road on a 90 degree day. But town driving, stop and go would get it up to 230 even with putting it in neutral at the lights and increasing the idle speed. I hit a deer last winter which required a new radiator. Installed a Cold Case, the two core, what a beautiful item. Replaced the fan shroud also and used the factory four blade fan. When it finally warmed up around here after the 4th of July, the same cooling issues returned. I have a complete 500 CI 73 Cad motor with a fan that looked like it belongs on a dozer. So I decided to give it a try. I used my Chevelle fan spacer, the center guide fit perfect, but I had to file out the 4 bolt holes a little. In place the Cad fan clears the harmonic balancer by 1/2 inch, protrudes out of the fan shroud about half way. With the hood open and I started the motor I could feel a lot more air movement. Yesterday took it into town and it was around 90 degrees, stop and go driving saw about 200 degrees and when you rev up engine the temperature drops pretty fast. The fan is a GM part # 1370318B. This is a big flex fan and when you rev the engine you can see the blades flex, but at an idle they are 3 inches deep. They move air!!!!
Do you think this is better than the original air conditioned Big block 1970 Chevelle GM 7 blade fan with a heavy duty clutch fan ? This cools my air conditioned Chevelle very well in 100 deg. weather.

1970 Chevelle SS396 (408), Fathom Blue,
Original Block & Forged Crank, KB Pistons, Edelbrock 6045 Heads,Comp Cam 292H, March Serpentine, RPM AirGap,750HP,100hp Nitrous
A/F Wideband,Tremec TKO 600, 12 bolt,
30 spline Moser Axles, Richmond 3:73's, Hotchkis control arms, swaybars, springs, Wilwood 12" rotors D/S, 4 piston calipers
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