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RE: [oletrucks] New member with a quest

To: "'Barry Heigher'" <bheigher@yahoo.com>, pigsmith@flash.net,
Subject: RE: [oletrucks] New member with a quest
From: "Hanlon, Bill" <Bill.Hanlon@COMPAQ.com>
Date: Fri, 26 Jan 2001 12:01:51 -0600
Might help with Chevy trucks.  Wont help with PorkChop's GMC.
The GMC VIN numbers do not give as much data as Chevy VINs do.

253 8C Y1018 decodes to 
        1018 ------------> incrementing serial number
       Y ----------------> Y = 55 second series, W = 56, T = 57, S = 58
                            I don't think there was a separate code for 
                            59.  Any supposed 59 model I have ever seen 
                            has had an "S" in this position of the serial 
     C ------------------> C = California plant.  P = Pontiac Michigan plant
    8 -------------------> 8 cylinder engine.  6 cylinder models have a
                            character here, not a 6.  In 1/2 and 3/4 ton 
                            trucks 8 cylinder engines were basically detuned

                            Pontiac V8's from the same year.  Compression 
                            ratios were lower and Bendix 2 barrel carbs were
                            used.  55 would have been 288 cubic inches.  56
                            317".  57 was 347"  At some point the
                            sizes were changed from standard Pontiac sizes
                            the engine became 336 cubic inches.  Larger
                            (I don't know where the split was) used a
                            of the Oldsmobile V8 of the day, either 324 or
                            cubic inches.   
253 ---------------------> Model.  101 is short 1/2 ton, 102 is long 1/2
ton, 15x 
                            is 3/4 ton, above that I can't remember.

Sounds to me like this 56 is actually a 55.  

-----Original Message-----
From: Barry Heigher [mailto:bheigher@yahoo.com]
Sent: Friday, January 26, 2001 10:06 AM
To: pigsmith@flash.net; oletrucks@autox.team.net
Subject: Re: [oletrucks] New member with a quest

Check out this site -- should help you.

Good Luck


--- pigsmith@flash.net wrote:
> Greetings,
> I am new to the list and have been just reading for
> a while.
> Lots of knowledge on this list.
> I have what I believed was a 56 GMC one-ton long bed
> stepside dually:
> VIN: 253 8C Y1018
> Somewhere in it's past it lost the original engine
> and
> four-speed Hydramatic transmission, which I would
> like to
> find. Can anyone tell from the VIN what engine it
> had and is
> it truly a 56? Whatever else you can tell me from
> the number
> would be great too.
> Thanks,
> porkchop
> oletrucks is devoted to Chevy and GM trucks built
> between 1941 and 1959
Yahoo! Auctions - Buy the things you want at great prices. 
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

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