Fan choices?
I would also recommend staying with the simple mechanical system that works... unless you really miss that 10 hp or so at the high end of your power curve.
I did not have room for any mechanical fan in front of my 451, even the new "shorty" Hayden fan clutch would have put the bolts less than 3/8" from the core of my 26" copper/brass rad. So I'm running a Contour fan, which is still a tight fit. Seems to be working fine so far, and the motor plate won't allow the pulley bolts to hit the plastic.
I would also recommend staying with the simple mechanical system that works... unless you really miss that 10 hp or so at the high end of your power curve.
I did not have room for any mechanical fan in front of my 451, even the new "shorty" Hayden fan clutch would have put the bolts less than 3/8" from the core of my 26" copper/brass rad. So I'm running a Contour fan, which is still a tight fit. Seems to be working fine so far, and the motor plate won't allow the pulley bolts to hit the plastic.