Over heating

[raceher2]

I am running a 355 with vortex heads demon carb DUI dis and double pass radiator. Have changed carbs distributors, fan, washers in thermostat still running 240 degrees. Plugs look good. Some people say header are getting a little red. Any ideas?

[3dinter]

I am running a 355 with vortex heads demon carb DUI dis and double pass radiator. Have changed carbs distributors, fan, washers in thermostat still running 240 degrees. Plugs look good. Some people say header are getting a little red. Any ideas?

What kind of Fan Shroud are you running ?

[derekb_rc9]

go too your local gm dealer get stock 4 blade fan they are the best thing. we run a 404 with a single rad in a ss

[raceher2]

We have a sheet metal shrowd just like our other 2 cars. We have 18 inch 4 blade fan and have tried 2 others.

[derekb_rc9]

what pully u have 1:1? and used red line water wetter

[3dinter]

We have a sheet metal shrowd just like our other 2 cars. We have 18 inch 4 blade fan and have tried 2 others.

We run a 28 x 31 Afco double pass with the 18" 6 six blade steel with 1 to 1 pulleys and the medium size washer in the rad neck and in the south summer heat i only get to around 220 when its like 100 outside. BUT my friends car uses no shroud and jb weld on some holes and a cheap nylon fan and his runs cooler than mine, go figure....we chased mine for almost a year without a shroud and with the 4 blade gm using all sizes of washers but nothing helped till i put in the shroud with the blades about an inch from the sides all the way around and about an inch of the blades inside the shroud. What kinda water you running, Tap ? distilled ? water wetter ? antifreeze ? what heat range are the plugs you are using ? timing set at ?

[raceher2]

Running 103 autolite plug 1:15 reduction pulleys 34 degree timing 3/4 hole washer running 114 octane fuel. My other car has plastic fan and runs 180 and I'm in south Carolina

[derekb_rc9]

we run a tstat with 3/16hole in it. we use just tap water then we put the red line water wetter in it. we do have a fan shoud it about 1" way but u can see blade some side about half of blade. her is a link too speedway motor for water wetter http://www.speedwaymotors.com/Red-Li...lant,1839.html

but u may find it at local parts store

[dillon_94]

same problem we had. took timing to 28 from 34 and no more red headers and the water came from 240 to now its down to 210 thats with a 15 in fan and a 22 inch rad and no stat with a crappy shroud

[raceher2]

Ok thanks everybody.

[racechik50]

You may think this is crazy but I use 2 cap fulls of Downy Fabric Softner in my radiator. We have a 2 pass, a electric fan attached to the radiator, and no shroud. Keeps my car 20 - 30 degrees cooler. No water wetter nothing, just straight water and Downy.

[Hurst390]

what do you guys run for pulleys with a double or triple pass radiator? 1-1 or underdrive?

[DANNY]

what do you guys run for pulleys with a double or triple pass radiator? 1-1 or underdrive?

I run a 30% reduction never have issues, have a double pass with good shroud and a 15" 4 blade fan and I havent put in any ducting to help push air in the rad and runs about 220 in the 100 deg heat... The rad is also at about 15 deg lean back top to bottom so even the air that hits it isnt square... Run tap with about a quart of dexcool antifreeze. I always have ran antifreeze cus in the end it helps prevent boiling and that what really messes you up... And I run a 180 high flow stat so when its cold I dont have to mess with the tape and trying to keep the dang thing warm...