68 BB Pulleys
I have a 427 w/o AC, w PS and no air pump. I need help on the pulley and belt arrangements, particularly the crankshaft pulley size and no. of grooves.
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Re: 68 BB Pulleys
Robert----
The car has had the AIR pump removed since ALL 1968 Corvettes were originally equipped with AIR----no exceptions, at all.
Some 1968 big blocks used a 2 groove waterpump pulley with an "add-on" single groove pulley "sandwiched-on" in the front. This front pulley was the AIR pump driver pulley. Other 1968 big blocks used a 3 groove waterpump pulley with the forward groove being the AIR driver. The 2 different arrangements used different sized pullies. The 2 groove pulley was 5-7/8" OD; the 3 groove pulley was 5-9/16" OD.
One of two crankshaft pullies was used with all 1968 big blocks. Most 1968 big blocks used stamped steel pulley GM #3921923. Some L-71 and L-88 MAY have used cast iron pulley GM #3863108. Both of these pullies are 6-3/4" OD and can be used interchangeably.In Appreciation of John Hinckley -
Re: 68 BB Pulleys
Joe, many thanks for the help.Comment
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