Yet here is a quote from Natrad, who have been building radiators for over 100 years and were suppliers of original equipment to , Holden, Ford and Kenworth.
" 1-2 row is ideal for stock standard vehicles and exact replacement requirements.
3-4 rows are best for high horsepower, performance or off-roading vehicles as well as trucks."
[URL]https://natrad.com.au/info-advice/picking-your-radiator-core-2-row-3-row-or-4-row/[/URL]
Trucks, hmmmm...
Kenworth Truck Radiator
Fits: T600, T700, T800
W900 - with CAT C15 500HP Engine
Years: 1988 to 2007
4 Row, High Efficiency Core w/ Bolted-on Tanks
Includes Surge Tank; Inlet Connection is Curved
From personal experiences, I've never had heating issues using more than 2 cores in a radiator. In fact, I've sometimes found benefits going to more cores.
Guess I'm just lucky.
One thing is for sure, maximize the surface area of the radiator
