Searching for original part numbers on motor tranny and rear - Pontiac GTO Forum
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post #1 of 18 (permalink) Old 01-31-2010, 04:04 PM Thread Starter
 
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Searching for original part numbers on motor tranny and rear

I will be looking at a 1968 GTO convertible tomorrow (Monday Feb 1). I have gotten a PHS on my own and I have the billing sheet, the options sheet and a power train sheet. While I have the list of options on this car how can I tell if the motor in the car is original to that car?

I read in one instance the last 7 or 8 numbers of my vin will be stamped on the back side of the motor block near the firewall and somewhere on the tranny the last 6 numbers of my vin # should be present is this correct?

Is it important to see serial #s on the heads and intake?

Thank you all

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post #2 of 18 (permalink) Old 01-31-2010, 07:02 PM
 
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5 engine codes just for the automatic 4 codes for a MT. So need more information to tell you your codes. 4 sets of heads numbers. 2bbl would be 9791214 (14)4bbl 49791216bl (16) 4bbl w/RA 9792731 (31) resembles "37" 4bbl w/RAll 9793596 (96) Exhaust manifolds Std is different from HO & RA then RAll are different too. Well tell you the 68 as alot of 68 only numbers. But need more information to tell you what to look for. LES
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post #3 of 18 (permalink) Old 01-31-2010, 08:04 PM
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The vin on the block is located on the front passenger side by the timing cover. See attachment. The 1st digit "2" = pontiac, the second digit should be an "8" = 1968. Yes, the last 6 digits of the block should match the last 6 digits of the cars vin to be a numbers matching motor. The heads are date stamped. Ex. F228 F= June(A=Jan. and so on)22 = 22nd day, 8 = 1968. the date is located under the lip of the valve covers towards the front of the head. Tranny, I'm sorry but I can't help you there. The rearend is also date stamped like the heads, located by the cover. Also, look for a 2 letter stamped axle code located on the backside of the axle tube, drivers side. That should match the 2 letter code hilited on your PHS "power train sheet" under "axle identification". If it's a safety track(posi) it will begin with an Y or Z, otherwise, it will begin with a W.

Here's a link to engine code locations and code definitions:

Pontiac Engine Codes

Good luck....
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post #4 of 18 (permalink) Old 01-31-2010, 09:16 PM Thread Starter
 
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Originally Posted by FNG69 View Post
5 engine codes just for the automatic 4 codes for a MT. So need more information to tell you your codes. 4 sets of heads numbers. 2bbl would be 9791214 (14)4bbl 49791216bl (16) 4bbl w/RA 9792731 (31) resembles "37" 4bbl w/RAll 9793596 (96) Exhaust manifolds Std is different from HO & RA then RAll are different too. Well tell you the 68 as alot of 68 only numbers. But need more information to tell you what to look for. LES
Thank you, thank you, thank you
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post #5 of 18 (permalink) Old 01-31-2010, 09:17 PM Thread Starter
 
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Originally Posted by 68greengoat View Post
The vin on the block is located on the front passenger side by the timing cover. See attachment. The 1st digit "2" = pontiac, the second digit should be an "8" = 1968. Yes, the last 6 digits of the block should match the last 6 digits of the cars vin to be a numbers matching motor. The heads are date stamped. Ex. F228 F= June(A=Jan. and so on)22 = 22nd day, 8 = 1968. the date is located under the lip of the valve covers towards the front of the head. Tranny, I'm sorry but I can't help you there. The rearend is also date stamped like the heads, located by the cover. Also, look for a 2 letter stamped axle code located on the backside of the axle tube, drivers side. That should match the 2 letter code hilited on your PHS "power train sheet" under "axle identification". If it's a safety track(posi) it will begin with an Y or Z, otherwise, it will begin with a W.

Here's a link to engine code locations and code definitions:

Pontiac Engine Codes

Good luck....
Thank you very much as well. So the valve covers need to come off to read the part#?
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post #6 of 18 (permalink) Old 01-31-2010, 09:24 PM Thread Starter
 
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Originally Posted by FNG69 View Post
5 engine codes just for the automatic 4 codes for a MT. So need more information to tell you your codes. 4 sets of heads numbers. 2bbl would be 9791214 (14)4bbl 49791216bl (16) 4bbl w/RA 9792731 (31) resembles "37" 4bbl w/RAll 9793596 (96) Exhaust manifolds Std is different from HO & RA then RAll are different too. Well tell you the 68 as alot of 68 only numbers. But need more information to tell you what to look for. LES
I have 400CDI 350 4bbl Automatic. My search tells me blocvk casting #9790071

My tranny research tells me PX678B123456

My engine production# research tells me 28B123456
YS

I think they are all right. It's taken hours to try and figure it out for the first time
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post #7 of 18 (permalink) Old 01-31-2010, 09:39 PM
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Thank you very much as well. So the valve covers need to come off to read the part#?
No. See attachment for date code, #3. You may have to crouch down a little tomorrow to see the code.
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post #8 of 18 (permalink) Old 01-31-2010, 09:40 PM Thread Starter
 
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Originally Posted by FNG69 View Post
5 engine codes just for the automatic 4 codes for a MT. So need more information to tell you your codes. 4 sets of heads numbers. 2bbl would be 9791214 (14)4bbl 49791216bl (16) 4bbl w/RA 9792731 (31) resembles "37" 4bbl w/RAll 9793596 (96) Exhaust manifolds Std is different from HO & RA then RAll are different too. Well tell you the 68 as alot of 68 only numbers. But need more information to tell you what to look for. LES
thank you I have ys motor code so 4BBL w/out Ram air = 49791219bl(16)
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post #9 of 18 (permalink) Old 01-31-2010, 09:53 PM Thread Starter
 
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No. See attachment for date code, #3. You may have to crouch down a little tomorrow to see the code.
so redarding the heads one can only identify a date that would confirm a build date close to the blocks. There are no # on the heads that would include my vin# correct?
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post #10 of 18 (permalink) Old 02-01-2010, 06:48 AM
 
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so redarding the heads one can only identify a date that would confirm a build date close to the blocks. There are no # on the heads that would include my vin# correct?
That is correct no vin, on the heads. Mostly they will be in the built within a month of the block date though. LES
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