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

Do you recognise this bolt?

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Old Jun 22, 2009 | 12:26 AM
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Default Do you recognise this bolt?

As I was entering my driveway I heard a metallic clink. I stopped and found this bolt in the gutter where my vette enters. 1988 Auto Coupe.

http://www.flickr.com/photos/37079655@N07/3648840749/

Please does anyone recognise it? It is a loose fit in a 10mm socket and a 3/8th socket goes halfway on, the head is maybe a little tapered, it's also badly rounded and I filed the burrs off to check the fit.

The only bolt I know that is this long holds the altenator bracket on and it's not that one.

Could it be front C beam bolt? or from the suspension? somewhere else? or not from my vette at all.
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Old Jun 22, 2009 | 12:27 AM
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At first I thought it might be C beam, but it's much too short...

Last edited by Mark85Vett; Jun 22, 2009 at 12:32 AM.
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Old Jun 22, 2009 | 12:32 AM
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I'm thinking C-Beam....but it looks too short...lemme measure mine...

Yup, A C-beam Bolt is almost 7" long.
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Old Jun 22, 2009 | 12:33 AM
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Check your engine accessories, like the the alternator, smog pump, A/C comp, etc.... too small & short for a c-beam.
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Old Jun 22, 2009 | 12:59 AM
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It kinda looks like a bolt from the rear suspension but they're longer than that. My guess is that its from an exhaust bracket.
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Old Jun 22, 2009 | 01:34 AM
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its too clean to be an under-carriage bolt, I'm guessing an upper bracket on the engine.
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Old Jun 22, 2009 | 02:11 AM
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Originally Posted by JrRifleCoach
Check your engine accessories, like the the alternator, smog pump, A/C comp, etc.... too small & short for a c-beam.
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Old Jun 22, 2009 | 05:04 AM
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Originally Posted by whalepirot
I'm with these guys. Sure hope you find it!
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Old Jun 22, 2009 | 05:27 AM
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Originally Posted by JrRifleCoach
Check your engine accessories, like the the alternator, smog pump, A/C comp, etc.... too small & short for a c-beam.
- check the alternator, especially behind the pully. even if loose, i don't know how it could have worked its way out...

Last edited by Joe C; Jun 22, 2009 at 05:31 AM.
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Old Jun 22, 2009 | 05:44 AM
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If it just fell out it probaly was not on something turning at the time I would think that would have made a more spectacular exit..LOL Have you worked on any area of the car lately and could have forgoten to tighten something up? If I had to make a SWAG I am leaning towards starter. Are any bellhousing bolts that long? Just wild guesses..
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Old Jun 22, 2009 | 06:00 AM
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Ok got clever and played detective and did a search for posts from you.. About a month ago lining up rear bumper and the body shop that did not get it lined up straight. What do they need to remove to get to the bumper bolts I bet it is on the list of things in the way.. Also to somewhat rounded head in that it fits a 10mm loose and 3/8 very tight would lead me to believe it started life as a 10mm and something that is on fairly tight.. Spare tire? Radio antenna? Gas tank? what has to come off to change a bumper I bet has something to do with the bolt.
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Old Jun 22, 2009 | 06:07 AM
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Upper AIR pump bracket.

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Old Jun 22, 2009 | 08:55 AM
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Originally Posted by ddahlgren
If it just fell out it probaly was not on something turning at the time I would think that would have made a more spectacular exit..LOL Have you worked on any area of the car lately and could have forgoten to tighten something up? If I had to make a SWAG I am leaning towards starter. Are any bellhousing bolts that long? Just wild guesses..
If it fell out of the starter it wasn't the right bolt anyway. Starter bolts have knurling around the shaft. I agree with everyone who guesses upper engine bracketry, especially the one EastCoastHD sent a pic of.
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Old Jun 22, 2009 | 06:57 PM
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I found it!!!!! It was the forward top bolt holding the Nippondenso compressor.



EastCoastHD - that was my first thought, I checked immediately but the bolt was still there - also it's larger than 10mm, but the small bolt on that bracket, for the altenator, has exactly the same head, with the flange. I put my 10mm socket on it and it was identically as loose as on the bolt, so I knew then that the bolt WAS off my vette.

How lucky was I that it fell off at my driveway and not while driving.

ddahlgren - you qualify for the 'Sherlock Holmes' award, some clever sleuthing there. I was going to take the bolt to the people who fitted my bumper and ask them if it looked familiar!

Thanks EVERYONE for your help
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Old Jun 23, 2009 | 12:38 AM
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I ran a K&N cone for a while but the power loss from high underhood temps was quite noticeable. The improvement when I fitted the '85+ hood to my '84, allowing the later C4 stock induction to pull the cool, pre-radiator air, was remarkable.

Originally Posted by EastCoastHD
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Old Jun 23, 2009 | 01:06 AM
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Originally Posted by Stingraynut
I found it!!!!! It was the forward top bolt holding the Nippondenso compressor.



EastCoastHD - that was my first thought, I checked immediately but the bolt was still there - also it's larger than 10mm, but the small bolt on that bracket, for the altenator, has exactly the same head, with the flange. I put my 10mm socket on it and it was identically as loose as on the bolt, so I knew then that the bolt WAS off my vette.

How lucky was I that it fell off at my driveway and not while driving.

ddahlgren - you qualify for the 'Sherlock Holmes' award, some clever sleuthing there. I was going to take the bolt to the people who fitted my bumper and ask them if it looked familiar!

Thanks EVERYONE for your help
wait, what does the compressor have to do with the bumper??
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Old Jun 23, 2009 | 02:32 AM
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Originally Posted by jhammons01
wait, what does the compressor have to do with the bumper??
Its all relative;
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To Do you recognise this bolt?

Old Jun 23, 2009 | 03:36 AM
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Close call!... i was looking for a missing bolt on my hd and my vette! LOL j/k glad ya found it.
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Old Jun 23, 2009 | 05:46 AM
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Originally Posted by whalepirot
I ran a K&N cone for a while but the power loss from high underhood temps was quite noticeable. The improvement when I fitted the '85+ hood to my '84, allowing the later C4 stock induction to pull the cool, pre-radiator air, was remarkable.
I know. After replacing the stock TB with a BBK 52 mm, the stock intake duct would not fit the larger TB. I tried heating with a heat gun and stretching, no luck.
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Old Jun 23, 2009 | 08:18 AM
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Originally Posted by EastCoastHD
I know. After replacing the stock TB with a BBK 52 mm, the stock intake duct would not fit the larger TB. I tried heating with a heat gun and stretching, no luck.
Mount is no larger ,just that for some reason BBK have a ridge where as stock intake doesn't.
Little fit of filing makes it easier
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