Let's not be talking bad about my beloved SD fan clutch! ...but seriously, I have them on all my Pontiacs and have talked another six or seven people in our GTO club into installing them. So round that up to about a dozen and only my car has developed a squeal. Our two '65 big cars have one belt to run the water pump and alternator and 19.5" fan with the SD clutch and that one belt doesn't squeal on either car.
The really weird thing is hot or cold, battery low or fully charged, that damn squeal is exactly at 3,250 RPM and 100% repeatable. You would think that different conditions at different times would make the squeal at a higher or lower RPM but it is always at exactly the same Engine speed - and racing the engine in the driveway or buzzing down the freeway.
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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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