I have the fan pushing the air through on my 37 chevy p/u and I have not had any problems yet,what motor do you have?. I am running a 57 235 and with a shortened pump the pulley is too close to the radiator and too far down. When I get the new chassis done I think I am going to look into the adapter to mount a 216 and early 235 pump to the 55-62 235s if I keep the 6. Jeff