Did all early 69 BB use a cast crank pulley and all late 69 use the stamped pulley? The way I read my GM parts book all 68 and 69 427/390 used a stamped pulley #3921923.
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Re: Crank pulley
Brad-----
These 68-69 big block balancer pullies are an area where I think there may be some inaccuracies in the P&A Catalogs. In GENERAL, I think that 1968-69 with L-36 used the GM #3921923 stamped steel crank pulley and L-68/L-71/L-88 used the 3863108 cast iron crank pulley. The latter pulley was also used for ALL 1965-67 Corvette big block crank pulley applications.
I would not rule out the possibility that some 1968-69 L-36 engines weree originally fitted with the 3863108 or that some L-68/L-71/L-88 were originally fitted with the 3921923. Both pullies are functionally interchangeable so they can be interchanged on an engine without the need to replace any other components.In Appreciation of John Hinckley -
Joe thank you
Joe I recently got a bunch of repro engine bolts from Paragon and they are almost all zinc plated . Some are V/C, oil pan, timing cover, motor mounts to block, intake, bellhousing PS + alt Bracket , Water pump and outlet . It seems like some of these bolts were natural with no plating.Comment
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Re: joe read previous post *NM*
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Re: Joe thank you
Brad-----
Originals were as follows:
valve cover-----plain (steel valve covers); zinc plated (aluminum and chrome covers)
oil pan----plain
timing cover----plain
motor mounts to block----phosphate
intake-----phosphate (cast iron manifolds); zinc (aluminum manifolds)
bellhousing-----phosphate (usually) or zinc
alternator bracket---phosphate or zinc
waterpump-----phosphate
thermo housing-----phosphate or zinc
However, it does not matter what finish that most of the above bolts have since most are painted with the engine. In most cases in which the bolts are not painted (i.e. aluminum manifold, aluminum valve covers, chrome valve covers), zinc is the correct finish. So, the Paragon bolts are just fine being all zinc plated----no one will know the difference after painting of the engine. The only exception is the motor mount-to-block bolts. These were phosphate finished and were not painted.In Appreciation of John HinckleyComment
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Re: Joe thank you
Joe what about the crank pulley And fuel pump. Thank you very much for all your help!Comment
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Re: Joe thank you
Joe just 1 more fastener question. were the V/C retainers zinc ?Comment
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Re: Joe thank you
Brad------
GENERALLY, crank pulley bolts are phosphate, although some might have been zinc. Fuel pump retaining bolts were phospahte, too. Neither of these applications were painted since both were installed on the engine at St. Louis.In Appreciation of John HinckleyComment
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