[1sick96]

hey guys I have a 406sbc and for the life of me don't understand why (i think) that I run SO hot I know it is Florida 95 degrees most of the time Stop and go traffic BUT I have a custom allu rad 25x20x5 2 x12 pusher ele fans, and a 37 gpm ele water pump this motor should be Ice cold I would think but It go to 210-220 degrees is this normal?????

my 406
11.5:1
93 octane
Motown cast Iron heads


Please Tell me what you think. If you have a street driven 400 let me know what temp you are running thanks guys/gals

[Notorious]

These are not alarming temps but ideally it should run cooler. What temp(s) are your fans set at? A 37 GPM pump seems a bit small for your situation, not much wiggle room. I use a 50 GPM Meziere on my 388. With a 180 stat and fan temps set at 185 and 200, it works nicely, staying right around 190 to 200 max. I also use a DeWitts racing radiator with a built in engine oil cooler. Same length and height dimensions as the stock radiator but with two rows instead of one. '95 Corvette LT1.

[1sick96]

Originally Posted by Notorious

These are not alarming temps but ideally it should run cooler. What temp(s) are your fans set at? A 37 GPM pump seems a bit small for your situation, not much wiggle room. I use a 50 GPM Meziere on my 388. With a 180 stat and fan temps set at 185 and 200, it works nicely, staying right around 190 to 200 max. I also use a DeWitts racing radiator with a built in engine oil cooler. Same length and height dimensions as the stock radiator but with two rows instead of one. '95 Corvette LT1.

I run the fans all the time. I also have a 180 hi flow stat. it just seems to me that the coolant moves around too much in the rad (not staying in one spot to cool down) and when the stat opens it just feeds too much threw and too fast. BUT I may be wrong it won't be the first time.

Do you run your pump all the time or run it with a thermo switch on/off style?

[Notorious]

Originally Posted by 1sick96

Do you run your pump all the time or run it with a thermo switch on/off style?

Constant. It's been in use for over 30K miles this way.

[302 Z28]

Are your fans in front or behind the radiator? Do you have a close fitting fan shroud?

FWIW, electric fans are not always the answer.

Vince

[58Apache]

Have you thought about putting the thermostat in a pan with hot water and thermometer to test at what temperature it opens?

What kind of temp gauge are you using and how sure are you of it's accuracy?

Where is the sensor located on the engine?

Steve

[ernkazern]

Put the fans behind the radiator and put a snug fitting shroud around them to funnel the max amount of air through the radiator core.

[41 mopar]

I run A 400 30 over in my 41 coupe it runs aruond 180 -185 I think your problem is your fan 12" seems a bit small Iuse a 16 " puller. also check the temp in your engine compartment. I had to open up the inner wheelwells to get some air moving around the headers

[crash70rs]

Something I seen with 400 blocks running hot are the passage sizes in the head gaskets. Had a similar problem in my Mom's car. Unfortunalty I don't remember the details, but there was one passage that was blocked and other that we opened up a bit. Made a huge difference.
Can anyone elaborate?