C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Stock Pulleys

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Old Apr 21, 2010 | 02:29 PM
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Default Stock Pulleys

I have a problem. Appearantly, whoever had my car before put on a smaller crank pulley, larger water pump pulley, and a larger alternator pulley to get a few more horses. I want to go back to stock pulleys, but after talking to the local dealer I found out that the pulleys are discontinued. I know I can buy them from one of our corvette parts companies or ebay, but I thought I would try here first to see if anyone would be interested in a swap or a cheap purchase. The stock pulleys were only used on 85 to 91 vettes. I was hoping that it was a standard so I could head to the local junk yard, but not the case.

I had an alternator guy put a standard pulley on for me, but now my belt is too long. To get it right, I need a stock water pump pulley (part# 10105209) and a stock crank pulley (part# 14055116).

Anyone out there got some spare stock pulleys?
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Old Apr 21, 2010 | 02:45 PM
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When you go from under size crank set to standard set, you are going to have to go to a different length belt even if you change back to the full stock set.

You might go on the parts for sale forum and offer a full swap.
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Old Apr 21, 2010 | 08:24 PM
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Different size belts are pretty easy to get. They come in approx 1/2" increment sizes. After you get your pulleys, see approximately how much shorter or longer a belt you need and buy that size and one longer and one shorter. Return the ones you don't use.
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Old Apr 21, 2010 | 08:47 PM
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Sure someone would swap you out for a set real quick..
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Old Apr 21, 2010 | 10:13 PM
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Are they steel or billet aluminum? We might be able to work sumthin out, meet halfway on I-20/59. I am 2.5 hrs from Bham.
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Old Apr 23, 2010 | 10:27 AM
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They are steel, but they have been painted silver (kinda weird). I have already purchased a stock set from a salvage yard. HlhnEast, if you want my old set of pulleys I would be willing to sell them to you and mail them to you rather than drive that far.
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Old Aug 15, 2013 | 01:46 PM
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Default pulleys

1987 corvette tuned port. I'm have overheating issues, can anyone tell me the original pulley sizes, PLEASE . thanks
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Old Aug 16, 2013 | 03:44 AM
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Originally Posted by cityautokelowna
1987 corvette tuned port. I'm have overheating issues, can anyone tell me the original pulley sizes, PLEASE . thanks
3 years later, i think you should post a brand new thread
to get some help.

Are you sure your overheating problem is caused by the pulleys?
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Old Aug 16, 2013 | 05:29 AM
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I had an underdrive kit on my 90 GTA, and that thing would idle for an hour in 100 degree weather, and not heat up past 212. I really dont think its the pulleys. What kind of temps are we talking about. Its not uncommon for Corvettes to run between 220-230. h
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Old Aug 16, 2013 | 10:54 AM
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Default overheating 87 vette

not sure why its over heating, but the pulleys have been changed, I would like to know what the original sizes were, also the front air dam has been ripped off, the two factors might be the problem.
this is a new car to me. not three years
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Old Aug 16, 2013 | 11:25 AM
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Originally Posted by cityautokelowna
not sure why its over heating, but the pulleys have been changed, I would like to know what the original sizes were, also the front air dam has been ripped off, the two factors might be the problem.
this is a new car to me. not three years
This post is. It's better to start your own new one so people won't have to read through old achived posts.
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Old Aug 16, 2013 | 01:42 PM
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I have a full set of stock pulleys from my 91 that I will sell reasonably.
Oklahoma - have you cleaned out the trash bags, leaves and the Texas armadillo carcass that are probably clogging your radiator? The C4 is a bottom sucker which causes junk to lodge between the radiator and the AC condenser. You can remove the air cleaner assembly and the cover over that space and easily clean out the crud. Here is a pic of the 87 I used to own and the junk I found in there. Shortly after cleaning it out I got stuck on I94 near Gary, Indiana and had to idle in 96* humidity for over 2 hours with no overheating
Before:

After:
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Old Aug 16, 2013 | 02:30 PM
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thanks, but we have a new rad, new condenser, new water pump etc, we plugged the egr valve, that seemed to help, but I would like to know the sizes of the original pulleys
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Old Aug 16, 2013 | 03:00 PM
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Try bypassing the heater core, and check your timing. h
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Old Aug 18, 2013 | 03:32 PM
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Default stock pulley sizes

Just measured the pulleys from my 87. Crank pulley is 7 9/16", water pump 5 5/8", alternator 2 7/16". These are just sitting in a box as I installed underdrive pulleys this past winter. These measurements are from the outer lip and not the actual surface the belt rides on.
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Old Aug 19, 2013 | 12:52 AM
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Well fletch, he really needs the actual surface the belt rides on.
Don't need to be exact but within a 1/4 inch.....
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Old Aug 19, 2013 | 04:44 AM
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Very well, the belt surface diameters are : crank pulley 7 3/16", water pump 5 1/4", alternator 2 3/16".
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