The multi pass radiator is a gimmick. It adds to the time the coolant stays in the block and that is wrong. Keeping the coolant in the radiator longer is just wrong, no matter how many times it’s argued.
To me it looks like the rad is 1/3rd the size just longer, most high output water pumps are rated 35-55 GPM, do you think you could get 55 gal of water through a 26" rad w/ 1 1/4" hose. It still comes down to the smallest part of the system, to me it looks like the thermostat.
