I have twin 283's in a 
I have twin 283's in a '61 Chriscraft. The Port engine starting this spring has needed to run at high rpm to get the water pump running. I replaced the impellers about 3 years ago and it was working fine. I usually run at low rpm and not very far. yesterday at 2000 rpm noticed steam in exhaust and temp gage up to 130 from normal 100. Do I replace the impellrrs again? Any suggestions? Thanks
I have twin 283's in a '61 Chriscraft. The Port engine starting this spring has needed to run at high rpm to get the water pump running. I replaced the impellers about 3 years ago and it was working fine. I usually run at low rpm and not very far. yesterday at 2000 rpm noticed steam in exhaust and temp gage up to 130 from normal 100. Do I replace the impellrrs again? Any suggestions? Thanks