A31PKG
Well-Known Member
For about $22 you can get a Hayden #1705 clutch. You can also find inexpensive used clutch-style fans all day (on the bag, swap meet, salvage yards, etc). I posted a thread a while back on the subject of fan clutches. I researched the spec section of the Hayden catalog and found that their #1705 was the closest to the original 070 style clutch in terms of dimensions. The only real issue for me is that the flange holes are slotted, instead of actual holes like the o.e. part... All of Hayden's clutch flanges appear to be slotted this way. Otherwise, it fits and functions just fine. I would recommend this set-up over a flex fan. I've seen them come apart at higher RPM's. As far as the 15 horsepower gain that MP claims-I've not heard or read anything to substantiate that, but it stands to reason that if fan drag is reduced under hard acceleration, that the engine would have some free HP to put to the wheels.
