Fixed cooling fans for a 340

Kenflo said

Low airflow through the rad during parade cruising and extended idle time like not moving at all is what I believe is the problem, I could be wrong but I am willing to do a fan swap to see if it helps. Car runs great in all other conditions. I’m not 100% convinced that the 5 blade fan with Hayden HD short clutch is the best fan for my combo especially during those conditions.

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Read this post you made again. You know what the issue is. My point is your fix isn't a fix.

Screw it. I'll type it out again.

You have an air flow AND a coolant flow issue. A fan change won't move the needle.

You need to look at your pulley sizing first. The water pump and the crank need to be turning the same speed (1:1) at least. If it's not 1:1 you need to correct that first.

If you are under driven, which I suspect you are the fan and the water pump are turning less than crank speed.

Like I said, you can change the fan to anything you want, but if the pump and the fan are turning too slow it won't matter.