Pontiacs of Tennessee Members Only Site

66yak · Posted: Fri Jun 25, 2010 1:45 pm Post subject: Big block cooling

Does anyone have a big block radiator they are needing to get ride of? I am having some trouble cooling my new 455+ during these hot summer days in TN. I have a year one radiator in it now that was a factory replacement and it cannot move enough coolant to keep it below 210-220 while running.
Thanks Dan

mark arnold · Posted: Fri Jun 25, 2010 7:10 pm Post subject: ideas

1. Is your water pump "blueprinted"?
2. Use no more than 50% antifreeze mix.
3. Make sure the fan is working properly. A factory clutch fan is best.
4. Is the fan shroud installed and the fan set to the right depth inside the shroud?

Is it overheating going down the road, in traffic, or both?
_________________
1970 GTO Hardtop WT Code 400
M20 4 speed
3.23 Safe-T-Track
Air Conditioning
Power Disc Brakes
Power Steering

mark arnold · Posted: Fri Jun 25, 2010 7:22 pm Post subject:

Lots of other things to check here:
http://forums.performanceyears.com/forums/showthread.php?t=578806
_________________
1970 GTO Hardtop WT Code 400
M20 4 speed
3.23 Safe-T-Track
Air Conditioning
Power Disc Brakes
Power Steering

66yak · Posted: Sat Jun 26, 2010 3:11 pm Post subject: Cooloing

Mark. The water pump is a cast pump that was rebuilt by a club member. So I believe it is correct. I do not have a clutch fan, I have the original set up without the clutch. I am using 50/50 mix. The shroud is covering about 1/3 of the fan. Fan spacer was changed to get it out a little further from the shroud.

mark arnold · Posted: Mon Jun 28, 2010 8:24 pm Post subject:

Does it heat up in traffic, going down the road, or both?
_________________
1970 GTO Hardtop WT Code 400
M20 4 speed
3.23 Safe-T-Track
Air Conditioning
Power Disc Brakes
Power Steering