Radiator sizes

[hammer]

In my 1971 Challenger convertible, it was a stock 318 with a 3 speed. I have now gone to a 340, mild rebuild and was looking to put a 4 core 26 inch radiator in for maximum cooling, but it seems the mounting plate will only accommodate a 21 inch. Were there 2 different radiator mounts put in the cars? For the six and 318, the 21 inch, and then for the 340 and big blocks the 26 inch? Just wondering? Thanks

 

[moparleo]

Yes

 

[challenger6pak]

You can buy new radiator core support side to widen the radiator opening.

 

[Chryco Psycho]

4 core tend not to be efficient , they add coolant capacity but the 4 th core will not add cooling , a high efficiency 3 core is better

 

[hammer]

So what you are saying is that an aluminum 3 core should be enough to keep this motor cool? I want to stay with the 22 inch. Should I get the electric fans also. I know a shroud is important too!

 

[Chryco Psycho]

Yes a 3 core should be fine , shrouds are a must , electric fans are marginal at best , a belt driven clutch fan is far better

 

[challenger6pak]

Adapting the shroud can be difficult when you are running a clutch fan. For that reason most people use the electric fans.