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Re: LT1 Burb:pully pictures 66 factory air 327
Well I know for a fact that the 65 and 66 factory air engine did not use a fan clutch and it is not listed in the GM parts book till either 67 or 68 trucks with factory air. My 66 does have the 5 blade fan which is part of the HD cooling which came standard with factory air. So I think the cast iron stud upper pully was used when they went to the fan clutch which the hub bolted on the studs of the cast iron pully. There is a great picture in the GM parts book of the fan pully arrangement of a factory air 65 or 66 in the parts blow up section in front of group nine I believe. I'm out of town so I'm not near my original 67 327 ac truck or the parts books at the moment. This 66 327 truck was built at Janesville and has a build date code of around June, 1966 and I have no doubts about this being the original parts on this engine. The truck has 67k miles on it and the spark plug wires are the original Packard date coded 1st qtr of 66 on them.
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