35 water pumps

[drezin]

I have a 35 with stock motor. And new higher volume water pumps. Recorred radiator and no combustion leaks. At 45mph no problems, but at 55 mph t will throw about 3 qrts. out the overflow in about 10 miles. Flow Is a lot of volume even at idle.I am thinking of removing the impeller shafts and turning about 25-30% off the bavk side of the finns. Any body else have this problem in a 35? I have thermostats in it.