I prefer the reliability of the factory fan.
Years ago, I went with a dual row chain in my dd. I did not when I rebuilt the engine for my 1980. I think a single row chain is plenty reliable. If the motor has miles on it, a new, quality, single row chain with metal guides will probably out last the motor. Wont it?
Also, a dual row chain is more rotating weight, is it not?
Im no motor expert but these are my thoughts as of this time
