Do stroker motors tend to run hotter than standard stroke motors?

They won't run hotter if the cooling system is up to the task. If you build a 600 hp engine then you need a 600 hp coolant system. Doesn't matter if it is a stroker or not. The coolant system has to have the capacity to cool the engine when it is making power.
I put a C body radiator in my Duster when I installed the low deck 512. That setup worked great. The thermostat would open up at 180 degrees and the engine would stay right around 180 degrees while I was driving the car. Only time it got above 180 was on super hot days if I got stuck in stop and go traffic. The temp would climb up to 190 or 200 when the car was stopped but would drop back to 180 once the car was moving.

As AndyF pointed out the motor will make heat based on the HP it makes, a 650 HP SS 440 6 pack motor will make as much heat as 600 HP low compression stroker 526 CI RB motor will make as long as the casting are close on the same thicknesses
More HP = more BTU in heat to cool

The reason I asked is I recently put a 400/470 in my Dart but I haven't run it in the car yet . It's only been run for the break-in outside of the car. I have a 22" A-body radiator that I recently had re-cored and upgraded to a three core. I was just wondering if the radiator would likely cool the motor sufficiently or not. There will be no racing going on, just local street driving. I also had installed a 180 degree thermostat in the motor.

572 Hemi stroker here, 11:1 compression and aluminum heads. Runs at 160-175 (in hot temperatures) with a stock clutch fan, shroud, and reproduction Glenray radiator.
AG.

A lot of capacity is in airflow, and a shrouded, seven blade stock fan with viscous drive gets the job done the best IMHO. I used a three core aluminum 26 wide b body radiater and the seven blade/viscous drive on a 504 hp 408 cube smallblock, worked so well i know there was more than enough cooling capacity.

A 22 inch radiator might work as long as you have a shroud and a big fan. The factory typically used a 26 inch radiator with big block engines.

Big Blocks with either A/C, or steeper gearing. Most used 22" radiators. 383 Super Bee's 440 GTX's, etc.

Two of my three GTXs had 22" radiators. Never made any sense to me, but that is what they had. Kinda goes along with the torque boxes and open rears as standard equipment on them.

And I also agree that the OP's biggest issue may be getting enough air flow through the radiator at slower road speeds.

I have a 416" small block stroker with 22" radiator with shroud and viscous fan. Radiator is a 4 core cheapy Champion Chinese job. No over heating issues.

A buddy (Troy on Moparts) has two Super Stock Hemi Dart and Barracuda* tributes with 22" radiators. No issues.

472" auto and 528" 4 speed Hemis. Both have stock brass radiators with high density cores (more tube and higher fin count). They have vicous fans but NO shrouds (because factory delivered them that way)

Both radiators done by Glen Ray Radiator. The 528 is Siamese Bore even! No overheating.


*Barracuda sold to Ohio just today.

One thing to consider is how much power the engine is generating at any given time. If you're just cruising, then the stroker isn't generating any more power than the stocker. In that case, the stock system is adequate. And the stock system will tolerate occasional full power runs.

It's when you're using more power more often that an upgrade is needed. Think trucks with a towing package. They're expected to run at full power more often and need the better cooling package.

Personally, I'd run what you have and see how it goes. If you run into a problem, work on airflow first.

Radiator capacity is always a big player. That being said, it is better to go wider when possible than adding additional depth.
Wider radiators expose more frontal area to air flow, assuming it isn't blocked by a tight core support.

Adding depth to a radiator is less effective. Air passing through the first core picks up heat. That means the second core is getting hit with hot air and can't transfer as much heat. The third core adds minor fluid capacity but gets blown on by slower moving air that has already been heated twice and is really turbulent. That is not a recipe for success.

Yes, additional cores help but to a limited degree.

which is why i prefer a wider core [crossflow ?] with two 1 1/4 or 1 1/2" core rows.