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Author Topic:   Plumbing a 2nd radiator?
Dirt Full Roller

Total posts: 53
posted May 10, 2004 02:54 PM  
hey, i need some quick help here. my car was running way hotter than planned with my 3 core so im looking at throwing in a 2nd radiator. what do i need to do to plumb in a 2nd radiator? what hardware is needed and where can i pick most of these items up at?

also, what type of fan seems to work best on a chevy 350?


Dirt Forum Champ
Total posts: 569
posted May 10, 2004 03:32 PM  
Installing a second radiator is the Websters defintion of putting a band aid on the problem and ignoring the source.

With a good fan (about 17" with no clutch), a clean radiator, shroud and the correct timing, you should not have problems overheating. Did you check/replace your T-stat?

Dirt Maniac

Total posts: 127
posted May 10, 2004 09:21 PM  
total agreement with these guys (second radiator) dumbest thing I`ve ever heard of to fix a heat prob

Dirt Full Roller

Total posts: 32
posted May 11, 2004 02:58 PM  
thanks guys for the help! i know i need a timing adjust as my car seems to be running rich. i was going to look into all of this and just run the second radiator as extra help! i also have a small vacuum leak could this also be part of my problem? when i set the timing last night i set it 10 when the motor was at idle, this would put me around 36 at 3,000 rpm. is that too much?

Dirt Forum Champ
Total posts: 569
posted May 11, 2004 03:05 PM  
A vacuum leak can easily cause the car to over heat. You gotta fix that first.

36 degrees at 3000 is fine if that is the total advance. Most racers lock the distributor in at 36 degrees with no advance.

Dirt Forum Champ
Total posts: 570
posted May 13, 2004 11:17 PM  
Here are some suggestions that I have done over the years to cure heating problems: Use a fan intended for racing, performance bodies has some good ones for under 20 bucks, use the body of a thermostat not the whole thing, use distilled water, use a cap that is the highest pounds for a stock radiator, reduce the drive, (use larger pulley on the fan than on the crank, clean the radiator out with a moderate flow of water and make sure the cooling finnes are clean of dirt, if all else fails, get an aluminum radiator. make sure the mechanical end of the motor is RIGHT or you will never cure the heating problem.

Dirt Freak

Total posts: 374
posted May 18, 2004 09:48 AM  
After consulting the experts at Stewart components. I Run the fan at crankshaft speed 1 to 1 no underdrive and no t stat or restrictor of any kind. These two changes lowered my temp 30-40 degrees.

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