check out www.pbseng.com and get their guide to racing preparation (X1/9).
It covers water pump mods.
I've had my motor putting out 150 hp crank without mods to the cooling
system, AND no fan!!!
I had an underdrive crank pulley to slow down the water pump. This is
important if you're revving constantly. Larger front rad "surface" area
helps, not more cores.
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