Motor for 1966 GTO - Pontiac GTO Forum
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post #1 of 15 (permalink) Old 06-18-2013, 03:46 PM Thread Starter
 
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Motor for 1966 GTO

Hi, I'm new to GTO Forum and I already have a question because is see you guys know what your talking about. I had purchased a 1966 GTO which need a lot of body work. The reason I had purchase this GTO is because the seller told me it was a numbers match GTO. I just found out recently that the motor came out of a 1965 GTO and is not the original motor for the 1966 GTO. I had called the owner because he had lied and told him the motor is not original. He said he had found a 1966 GTO motor in New York and he would get it for me in return for the 1965 motor. By changing the motor to a 1966 GTO Motor, Does that make the car original? I was under the impression that the numbers still would not match, I thought that even if the build date is correct, the other numbers would not match the VIUN number. Could someone shed some light on this issue for me? Thanks Guys:
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post #2 of 15 (permalink) Old 06-18-2013, 05:28 PM
 
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Will still not be numbers matching, but numbers correct. Numbers matching is all original drivetrain to the frame and body.

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post #3 of 15 (permalink) Old 06-18-2013, 06:30 PM
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Welcome to the forum,

Pontiac used some of the same casting numbers and letter codes for both 65 and 66,

If you find a 66 engine with the correct letter code and date code the car would be date code correct and there is no way to verify if that is the correct engine or not.

Pontiac didn't start recording engines until early 67 when they documented the engine unit number on the build sheet, in mid 67 they added the car's vin number to the front of the block.

What are the numbers on the block, intake and exhaust? Have you ordered a PHS packet to see which engine the car was born with?

Randy


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post #4 of 15 (permalink) Old 06-19-2013, 06:13 AM
 
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im not an expert and I could be wrong, but "numbers matching" always meant to me was that the casting date of the correct block was within 4 to 6 weeks prior to production date on trim tag. not very many gtos have the engine it came with from the factory. lets face reality. how many times do you see a gto for sale saying "numbers matching". they couldn't possibly have the original factory engine.
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post #5 of 15 (permalink) Old 06-19-2013, 10:57 AM
 
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My 66 has the original motor
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post #6 of 15 (permalink) Old 06-19-2013, 11:57 AM
 
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So does my 68
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post #7 of 15 (permalink) Old 06-19-2013, 01:22 PM
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..and so does the Beast. (even though it has been somewhat 'surgically enhanced' )

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post #8 of 15 (permalink) Old 06-19-2013, 01:56 PM
 
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My '66 is a numbers matching original. My guess is that there are still a lot of our cars with original engines. Perhaps rebuilt, but still the original blocks.

1966 TriPower, 4 spd, PHS documented.
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post #9 of 15 (permalink) Old 06-19-2013, 02:04 PM
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Depending on the build date of the car, if it was built in late `65 or early `66 it could have a `65 block. No?
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post #10 of 15 (permalink) Old 06-19-2013, 02:07 PM
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Originally Posted by Rukee View Post
Depending on the build date of the car, if it was built in late `65 or early `66 it could have a `65 block. No?
It most certainly could. The engine plants generally 'changed over' about mid-year, so that means an engine date-coded in June of '65 or through about May-June of '66 would most likely be a model year '66 engine.

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