Looking for info on 71 GTO - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 01-24-2018, 06:47 PM Thread Starter
 
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Hey All! My first post here, but I am no stranger to Pontiacs. I have an 08 G8 GT that I love and Iam a moderator on G8Board.

My uncle recently purchased a 71 GTO as a project. I don't think it's a numbers matching car, but I'm no expert.
I'm also curious if anyone can tell me what motor is in here if it is not stock.

If anyone can help out it would be appreciated!
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post #2 of 12 (permalink) Old 01-24-2018, 06:49 PM Thread Starter
 
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Moar pics
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post #3 of 12 (permalink) Old 01-24-2018, 07:36 PM
 
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YS = in 1971 was L78 300 gross [email protected] rpm / 400 [email protected] 2400 mated to automatic
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post #4 of 12 (permalink) Old 01-24-2018, 08:00 PM
 
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I might recommend that you blank out the last 4/5 digits of your VIN - you never know who might try to use them to build "your car" or claim you stole theirs by using a forged title. Just sayin'.
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post #5 of 12 (permalink) Old 01-24-2018, 09:58 PM
 
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Welcome. I also have a Holden built car that I really like. They made great cars down under....huge shame they closed up shop recently.

I am not too familiar with the 71 models but I will try and help anyway.
There were 3 engine choices for GTOs in that year. The base 400 cubic inch and two 455 mills, the top option being the LS5 455 HO. The PX trans is correct for base 400 automatic. Your VIN and cowl tag is Z which indicates the car was built in Fremont CA. The photo that looks like a partial VIN on the block appears to be from a different car so might not be the as born engine. Did your uncle acquire the PHS docs? Pontiacs of this vintage are well documented compared to some other makes so it pays to order the docs if the seller didn't offer them with the car.
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post #6 of 12 (permalink) Old 01-25-2018, 07:31 AM Thread Starter
 
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No on the documents. Where do I order these "PHS" papers and what are they?

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Originally Posted by Shake-N-Bake View Post
There were 3 engine choices for GTOs in that year. The base 400 cubic inch and two 455 mills, the top option being the LS5 455 HO. The PX trans is correct for base 400 automatic. Your VIN and cowl tag is Z which indicates the car was built in Fremont CA. The photo that looks like a partial VIN on the block appears to be from a different car so might not be the as born engine. Did your uncle acquire the PHS docs? Pontiacs of this vintage are well documented compared to some other makes so it pays to order the docs if the seller didn't offer them with the car.
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post #7 of 12 (permalink) Old 01-25-2018, 07:41 AM Thread Starter
 
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L78 = 396ci?

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ys = in 1971 was l78 300 gross [email protected] rpm / 400 [email protected] 2400 mated to automatic
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post #8 of 12 (permalink) Old 01-25-2018, 08:12 AM
 
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no - Pontiac 400ci. The YS code was commonly used for the base engine with AT - not unique to '71.
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post #9 of 12 (permalink) Old 01-25-2018, 02:02 PM
 
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One dark side of the collector car hobby involves illegitimate vehicles. Cars that start off as a lower/base model and then restored as something much more desirable. Fairly common with Chevrolet cars since there isn't a reliable authority to validate their cars. So a buyer of a big block Chevelle SS doesn't really know if the car is authentic. Original dealer invoices, warranty docs, registrations, titles etc go a long way to authenticate the car.

Fortunately, the Pontiac community isn't in that same boat. A fellow enthusiasts who worked for GM was granted permission to save much of the factory invoices when Pontiac was planning to toss those records. I am not sure exactly which years he has records for but I think the range is early 60s through early 80s. The guy with the records is Jim Mattison and the go to person to authenticate Pontiac cars from this era. His website is PHS-Online.com (I think..). If that doesn't work than just Google it and it should come up. All you need to do is fill out the form and submit your VIN and he will send you a copy of the original dealer invoice which shows how your car was built (model, body style, color, trim and other options).

I think the fee is $60 or $70. You will also get other useful documents besides just the invoice. He will send model year specific dealer order forms and reference docs that you can learn more about the car.

Not all GTOs can be identified by just looking at the VIN. Only the middle years had a special model designation "242". 1971 is the last year for that so your car is a GTO. If you had a 1972-74 or an older 64-65 model then the only real way to know if the car is a GTO is to check the PHS docs. This is because the GTO was an option package on the base model during those years.

Hope this helps.

Sent from my XT1585 using Tapatalk
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post #10 of 12 (permalink) Old 01-25-2018, 03:11 PM Thread Starter
 
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Thank you guys very much!

We just finished pulling the dash (used the forum to help), so now the engine and tranny are out and separated and the entire interior is out. Body will be sent off for blasting this week.

I'll try to update periodically as we bring this car back from the brink.
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