How do I know if I have a 22" or 26" Radiator?

[1971RR]

I've had my 71 Plymouth SSP/RR for about 26 years now. Every radiator I have ever installed has required some drilling in the flanges to make it match the bolt holes in the car. Of course, I do realize that I am ordering for a 71 RR/BB and my car was orgininally a 71 SSP/SB. How do I measure my current radiator to determine if it is a 22" or 26". Diagonally like a TV? Top to bottom? Side to Side? The reason I ask is that I need to order a fan shroud.

 

[yellowdartdave]

Side to side.

 

[72Satellite440]

Yep, dave is right along the top --Your prob going to want to go with a 26" rad if your switching from a 318 to a 383 or 440 cause those BB tend to heat up in slow moving traffic - or so ive been told. I went with a 26" Champion rad with a shroud off fleabay

http://www.ebay.ca/itm/1970-1973-Radiator-Fan-Shroud-Plymouth-Cuda-Road-Runner-GTX-Wide-Core-26-/220864924519?pt=Vintage_Car_Truck_Parts_Accessories&hash=item336c934b67

 

[1971RR]

I measured my radiator at one time and recall that it was a tad over 26" from side to side but I was not sure that was the correct measurement. Like I mentioned, I've replaced the radiator several time over the course of owning the car and they always seem to be a tad different. Like the newst one I have has the overflow tube pointing to the driver side when the overflow bottle is on the passenger side of the car. I'm just happy to have a new radiator. I believe I can have the cap cut/rotated/rewelded at a later date. I need a shroud as it does not like sitting for more than 5 minutes before getting hot. Once it gets going down the road it cools. Not quite like it used to but its about a tick above the last cool notch. Might need to invest in a new water pump at some point too.