415hp stroker, stock copper radiator, re-cored of course, stock explorer dress-stock steel fan, stock heavy duty clutch, 195 thermostat. 70 down the freeway at 109degrees, rock steady at 195 degrees. Pull off freeway, stop at light, idle, temp stays 195. Climb 5,000 feet to Rim, 5th gear, no change in temps.
Great news AZ!!! You are dialed!
I'm in the same boat now (after I sold my custom Ron Davis).
Two summers ago, 115deg, cruised for 40 miles..uphill for 10 miles some of the trip was at 70mph, last 6 miles uphill was at 20mph.
Temp went to t-stat at 195 in 2 miles. Stayed there till the 10 mile 2-3 deg climb and then it barely went up 2 degrees maybe and never moved again.
600 hp, 6r80 Trans, 40"s, Exploder clutch fan (stock not HD) with the steel fan. I have pics of the steel vrs plastic on this thread. Custom Speedway build yourself FSN shroud. Sooo simple and cheap. Glad I haven't tagged it up solid yet as I'm sure I will have to change it again after my new radiator.
Just a reminder that I ran a 74 or 75 Granada 351W radiator for YEARS and it never overheated either. $250 at Oreilly's. I swapped it in after the fancy smancy RD alum radiator fiasco.
I run a Griffin extra big radiator now with the 464stroker.
On my 3rd one now due to leaks. Radiator flex/bind is not the issue. Mounts tweaking the radiator is not the issue as it sits on 24" of the rad core on foam on the bottom and has a single 3" wide mount in the middle on the core on foam at the top. No binding possible just bad weld joints I'm guessing-at least this last one is as I can see it.
I am looking into a custom alum or copper one from US Radiator. They actually suggested alum rather than copper for my use which I though was interesting after I told them my intended use.
No pics