I always upgrade to the severe duty fan. Only had one club member hate the SD fan because of the additional fan noise under load. Funny thing is he lives in Palm Springs and the fan was simply doing what it needed to do. I haven't stepped down to the HD but the specs would indicate it would be a suitable choice in moderate temperature areas.
Most spacers are designed for a standard or flex fan and not to be used with a clutch fan. The spacer is meant to position the flex fan blades about where the clutch fan would locate them. Using a spacer with the clutch is going to amplify any minor imbalance in the fan blades and lead to a possible bearing failure in the water pump. Many years ago I had a bearing come loose in a new Cardone water pump and it allowed the fan to tilt and chew a hole in the radiator.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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