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ok fellow stang owners, i have a big problem!!!
I just rebuilt the 289 in my 67 coupe and i have a big over heating problem i have installed everything new but the rad.
(ordering it today a 4row) i.e. waterpump t-stat both hoses,bypass hose, motor was totley rebuilt bored crank turnde all new inside rods resized hv oil pump. motor runs grrrrr8 but will overheat after about 10 miles timimg is right on
(8btdc) has any one else had this problem??? note: still has the OE 6cyl.rad can it be that it is just too small for a new tight small block v8 holds 80psi oil press at idle any help will be greatly welcomed!!!!!!!!!!! thanks in advance GOLDWING
 

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rad. is way to small . New larger rad. should fix the problem.
Just don't cook the donk in the mean time.

If in doubt give it a clout
If at first you don't succeed , find a bigger hammer
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How far did you bore it? I've been told .30 or higher will tend to run hot. That in conjunction with the small radiator would probably do it regularly.

You have checked to see that water is actually circulating right?

One thing you might do to buy you some time until the new radiator arrives, is to remove the thermostat. That way it won't have as much opportunity to build up heat.

http://members.tripod.com/tangdar/
'67 Coupe project car (Did I say project car? I meant pile of rust)
http://www.americainter.net/~fevans/tangdar_flintstone.jpg
 
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I have the 4 row and have not had ANY cooling problems since the Install. Even when the thing was only half full. (oops!!) The 4 row should solve your problem.

Rex
1966 GT 350 Clone
289 (rebuilt with JE, Eagle, Arp)
Edleborck RPM Heads
Comp Cams hyd roller, Crane 1.6 rockers,
Holley 650 DP, Hookers 1 5/8, T-10, 3:55 Gears, Custom Dual exhaust with X Pipe
 

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Put the 4-row V8 radiator in. If that doesn't solve the problem, check that your head gaskets are installed properly. If they are backwards, and that is possible, then the engine will overheat. Also, I've been told that anything over .030, i.e., 0.060 will likely overheat. I replaced a fairly new rebuilt 289 with a 5.0L in my 66 coupe because I could never get it to run cool enough. I now have a 6 cyl in my convertible that runs hot at 70-75 with dual electric aux fans going and six blade engine fan. Cools back down when I drop to 60. I'm going to try a fan shroud, but may have to go bigger than the two row radiator. I've wondered about using a V8 radiator for a 67 (my convertible is a 67) and having the radiator shop change the inlets. Any ideas, gang?
 
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The 1970 Small Blocks had a radiator with the outlet on the bottom driver's side. This was a V-8 radiator which means the diameter of the inlet and outlet is larger than the six, which in turn means more flow.
 

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If your timing is correct, you may want to check your vaccuum advance. If it is advancing too much or too little, you can end up with overheating.
Get that radiator installed and let us know how it goes


You're just jealous because the voices only talk to me!!!
66 200 3-spd Coupe - emberglo, daily driver
65 289 4-spd Conv - Rangoon Red (what else)
66 Shelby - Red and Ready to be Restored
 

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1st step bigger radiator as other suggest. I already had the bigger radiator after my .030" bore and still got hot...I added the fan shroud and it made a big difference.

http://home.mindspring.com/~thedaughertys/_uimages/M1.jpg
67 Sports Sprint, Convert. Original C code,
Now 293 ci with Holley 450 and 295,000 miles
MCA #49294
 
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