Quote:
Originally Posted by whunter
The clutch to water pump bolt pattern matches, and they are an alternative - upgrade.
The plastic blade has better airflow and is lighter.
The aluminum blade will not function correctly on the later upgraded clutch, even if you can mount it, the air flow - mass - thrust - torque load is wrong for the design.
.
|
great info ya'll. just to clarify, on my 83 SD i can just replace the original metal fan/clutch with the updated plastic fan/clutch since it has that spacer for the water pump, correct? but i should also use the later version WP pulley to increase efficiency. the way i understand it is that the pre '81 617's are in need of the later model WP pump to engine housing?