your probably right. 

If your car was running at 180 degrees, you didn't have a 195 degree thermostat.  

With the rad out I've just run the garden hose into the manifold water neck and cranked it up. Pull the thermo first....you can try running both ways, put the hose into the water pump opening and blast the other way...might float some crap out wedged up in there. Makes a mess if you have rust....don't do it on a concrete driveway. No point in buying a rust dissolver (flush kit) since you cannot let it sit in the engine without the rad.

I will eventually get my brass radiator restored. but i couldnt afford the cost on that, the aluminum one is just a temporay. my radiator needs a lot of work to be usable again. it looks like a 1 to 2 core, looks very small for the 350 motor. Since its apart im detailing the engine bay

lots of good info on rads, can anyone give me the dimensions of the original rad that would of been in my 75 manual transmission. sold the old rad never gave dimensions any thought. no ac

Cindy, I have an old one I can measure. The rads SHOULD be the same auto or standard. The auto has the internal cooler for trans lines. Standard does not. I believe they are interchangeable. Standard won't work in auto, as the cooler is absent, but auto will work in standard. Just have to plug lines, for water and dirt contamination.

Cindy, here are some dimensions from my original ‘73 radiator. My car is a four speed so I do not have any connections for the AT cooler lines. Overal size measured to the outside of the end tanks, not including inlet/outlet pipes 32” x 19” x 3 1/2”. Core only dimensions, not inlcluding end tanks 28” x 18” x 2 1/2”. Hope this helps.. According to the vendors I can find, the same size radiator is used 73 to early 76. Let me know if you have any questions or need any further information.

thanks for that info. sites say rads fit from 73 - 76 so should be good. I have a manual as well. rad I had priced out in town which they looked up for me is not even close to the numbers you gave me

Cindy, you’ve probably got some wiggle room on the outside width dimension including the tanks. The critical dimension should be the 28” dimension I provided at the core. If you check the brackets at the bottom of your core support, that’s where the radiator is held into the core support. There should also be two brackets that bolt on to the top of the core support. The dimension between should match up with the brackets on the bottom. The dimensions between those four brackets, width, height and thickness are critical to how your new radiator with mount into your existing core support. Not sure what the Canadian pricing would be like including shipping, but I highly recommend Dewitt’s aluminum radiators. I ordered mine in their refinished “Black Ice” set up for a four speed, no cooling fittings to be plugged. Fit perfectly and it’s been running great for the last four years. Good luck !!