Join Date: Mar 2011
Location: Wichita Falls, TX
Radiator overheating-new radiator questions
Good afternoon everyone. The problem is on my 69. Originally it had a 307SB with the powerglide and 273 rear gears with open differential. Now i'm running just short of 400Hp in a 350SB, a beefed up powerglide, and 373 rear gears with an eaton posi. I never thought of this before I did all the changes, but here in Texas for the next few years with the HOT temperatures out side, 60mph running 3,000 RPM, along with the transmission running 3,000 RPM and all being cooled by the stock radiator/internal trans cooler.....it just can't seem to keep up. When I changed the engine, I thought I had enough foresight and put in a high flow water pump and a 160F thermostat..but that didn't do anything.
So now the question is......Since I am looking for a new more powerful radiator....should I buy one with a integrated trans cooler or should I run with a seperate trans cooler. Also if I run with an integrated trans cooler, should I use a radiator that is rated for my 400HP or should i jump it up to the next HP rating since it will also be cooling a fangs out transmission at high RPM along with the HOT daily temps of over 100F? IF the radiator is rated for 400HP can it keep up with a 400HP engine at 3,000RPM, the transmission running 3,000RPM and the 100F++ temperatures outside?
Thanks for your help.