Thread: 331 hemi from a new Yorker what temp is safe

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Wow so much help thanks all!!! Ok I'm not sure how to start but I will start with the temp is mechanical on the intake right beside the head. I have confirmed with a infared that I can trust the gauge up too 195-200 I never tested it at higher temps. I have not therm just a restricter plate at 1", hold on it gets much more interesting! I have the stock pump and pulleys. A new rad very big in the back of the rat with 32 feet of 2" pipe 26copper and 6' rubber. Rad in back of the pickup 142 wheelbase it's long 4'doors. I have a helper pump on the return with the fan on the top of the rad with a shroud good flow rad is on a 30% angle a little lower that the top of the intake. But I have a pressure tank that is higher and has hold 3 gal. As the hole system hold 9 gal. It all seems to work great except on those long hot fast trips. The nice this is i can stop shut it down leave fan and helper pump and cool to 140 in 5-10 min. I will add a pic as soon as I figure it out soon again I can't thx you all enough for all the advice!!

Wow! 32 feet of radiator hose!! You've got to have a circulation problem, and my bet is you've got air trapped in the system that is restricting flow. With nine gallons of coolant you shouldn't be seeing 220F cruising temps unless you're holding back the hot coolant from getting to the radiator. My first thought was that you may need to take the stock water pump out of the loop and just use a right sized electric pump? How did you select the flow capacity for the helper pump? I'm thinking two pumps in a closed loop may be your problem - one may be cavitating - but I'm not sure of that yet