Another solution to fan problems is a NAPA fan (P/N 823-1228) made out of fiberglass/carbon fiber. It is flat on the front face so that it does not go much further forward into the radiator than the front face of the water pump pulley. The blades then face to the rear about 1 1/2 inch. The nice thing about it is that it can be trimmed on the rear of the blades to clear things like the crank pulley if needed, trimmed to shorten if needed, etc. All that is needed is a strong pair of clippers or tin snips. The weight of the blade is so little that it really isn't a problem with balance as long as you are reasonably carefull to trim each blade about the same. I have used this fan on a couple of engines with good luck. At high RPM, it will pull forward some so they recommend a minimum of 3/4 inch clearance between the radiator core and the front of the fan. Also, be sure to use large flat washers under the bolts of if you have one of the short shaft pumps, usually they come with a disk to mount in front of the fan.
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