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Re: 1967 pulley help
Larry-----
The crankshaft pullies which you have are correct for your Corvette IF it is equipped with the L-79 327 (350 hp). There should be no spacer between the pullies. Instead, the assembly sequence should be balancer, GM #3858533 pulley, GM #3751232 pulley. Three 3/8-24 bolts with lockwashers are used to secure both pullies to the balancer hub section. Then, a 7/16-20 bolt with a large diameter, thick washer is used to secure everything to the threaded hole in the crankshaft snout. The washer will be in the center, seated against the outer 3751232 pulley. For all this to work correctly and for things to line up, your balancer has to be correct and of the correct thickness. This thickness should be 1-5/16".
If you have an L-79, your water pump pulley should be GM #3770245. Your power steering pulley should be a "3 spoke" cast iron pulley of GM #3834720. Your alternator pulley should be a machined steel pulley of GM #3829387 (originally it MAY have been GM #3875968 which is interchangeable with the 3829387).
Incidentally, believe it or not, all of the above-referenced pullies are still available from GM.
Now, don't forget, all of this applies if your engine is an L-79. If it's a base 300 hp, most everything will be different.In Appreciation of John Hinckley -
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Re: 1967 pulley help
Joe,
As an AC car, wouldn't Larry's 67 need an entirely different set of pulleys? If I read the books right that would be 3883234 on the water pump, 3850838 as well as 3751232 on the crank, and (maybe ?) 3770509 on the steering pump. The '66-'67 w/ L-79, AC, and PS was a unique drive belt set-up.
However, that is not reflected in what he is starting with. I wonder if the AC or the PS were retro-fits. This gets you into trouble if you don't swap all of the pulleys over. My recollection is that the '720 cast iron PS pulley runs on the second crank shaft belt track and will not line up with the third track on '232. Also, the '232 doesn't fit inside the deep grove '533 as he confirms in his second post.
I think more information is needed to sort out a workable setup.Comment
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Re: 1967 pulley help
Chris------
Yes, I missed the "with air" in the original post. Pullies then are as follows:
crankshaft (rear)----GM #3850838----discontinued
crankshaft(front, p/s driver)---GM #3751232
water pump-------GM #3890419 (original) GM #3995643 (current replacement)
alternator-------GM #3875968 (discontinued)
p/s pump---------GM #3770509 (discontinued) stamped steel type pulleyIn Appreciation of John HinckleyComment
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Re: 1967 pulley help
Thanks for all your help guys. I finnally gave up and drove down to Long Island Corvette Supply with all my pulleys. Turns out that my pulleys were all wrong, they were for a 63-65 vette. So $250 later, I left with all the right pulleys. There is a catch, after I got home and tried out the pulleys, I realized I forgot about the steering pump pulley. Well that ones is wrong too, i'll be heading back down to LICS on monday for it. It will be nice to have this finally corrected. I did get to start it up by leaving the steering pump disconnected, ran well and even the A/C compressor worked after sitting for 22 years! My next project is either Exhaust (mufflers delaminated) or my heater core, i'm not sure which one to do first. Thanks again for all your help, and if anyone needs some pulleys, i got a deal for you!
LarryComment
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Re: 1967 pulley help
Having never seen this set-up I'm curious. Were these of the wider, deep grove design?Comment
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Re: 1967 pulley help
Joe - I appreciate your information as well....my 67 has N40, C60, and K19 on the L79. I assume the numbers are all correct, except for the additional A.I.R. pump related pulleys....on the water pump and smog pump...is this true? I haven't stripped them all off yet (plan to when I change my water pump to the correct dated 326 casting) as well as the new finned balancer. Thx!....CraigComment
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