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I am currently running a 468 in a 27T altered. I have a Moroso elect pump. The chrome one the is kinda space age looking it pumps 19 gallons pm. IS this enough? Other guys can make a run and come around and do it again I can't. I have to cool it down. I have a fan on the radiator. I am 70 my wife the driver is 60 this is our first drag car. So every thing is a learning curve
You are running a thermostat or some thing to slow the water down right?
try a belt driven pump ? some testing was done on a dyno were some pumps could not keep up when the engine was at temp could not push water threw when psi when up . for racing you should have a restrictor or a 160 stat . can be other things as well tune up ? fan may not be working or not very good the only help it will be is in the pits or at the line to help cool it. T may not have a very big radiator .have you added water wetter or purple ice .liquid ice to water ?
I am not running a thermostat. I do have wetter water in it. I am thinking belt drive pump. Three or four horses is not as important to me as keeping the motor at workable temp.