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I'm running a stock radiator (read old) right now with a new shrowd and clutch fan on a 505 with a 3800 stall converter, I ordered a new radiator and I'll see where that gets me before I move the cooler



old rad , let me guess , 2 row ?

i think what ever don is doing is not going to be the cure all , a 505 inch motor needs a good cooling system. A better rad , a shroud , a good fan and a hi flow pump is going to be required also.