1964 76xw tri power - Pontiac GTO Forum
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post #1 of 28 (permalink) Old 09-11-2014, 06:52 PM Thread Starter
 
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1964 76xw tri power

is there really anything special about this motor in a 64 GTO?
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post #2 of 28 (permalink) Old 09-12-2014, 12:58 AM
 
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Yes, read the thread linked below, especially John V.'s inputs.

64 389 engine question - PY Online Forums

In my observations finding a 64 76X or 78X in rebuildable condition is rare. Those who are restoring 64s and seeking numbers matching configurations will pay for a 78X or 76X.

Rick

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post #3 of 28 (permalink) Old 09-12-2014, 07:58 AM Thread Starter
 
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Thanks. Is this the case even if it is not the original block from the car. Also why the xw?


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post #4 of 28 (permalink) Old 09-12-2014, 08:10 AM
 
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Originally Posted by tguggino View Post
Thanks. Is this the case even if it is not the original block from the car. Also why the xw?
I believe the 64 block had an engine unit (identification) number that was different from the VIN. So "numbers matching" really isn't for the early GTOs. And the W code = 4 speed, X means both automatic and manual flywheels can be mounted.
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post #5 of 28 (permalink) Old 09-12-2014, 09:13 AM
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Numbers matching IS for the early GTO's. The Engine Unit Number, listed on the factory Protect-O-Plate, I.D's the engine to the car. VIN numbers did not appear on GTO engines until the '68 model year, and were different from the EUN. Agree that the 76XW is a real rarity these days.
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post #6 of 28 (permalink) Old 09-12-2014, 09:17 AM
 
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post #7 of 28 (permalink) Old 09-12-2014, 10:50 AM
 
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From my understanding the code 76 alone tells you it is a 1964 389 cid 348hp tri-power with a manual transmission. The X stamped tells you that the car was for the standard manual transmission. The standard 64 GTO came with a 3 speed manual. If you optioned for the 4 speed wide ratio that is where the W stamp came in. The code number 8 was stamped on the block if the engine was matched to the 4 speed close ratio trans which was offered later in the 64 model year. So 76XW is the optional 4 speed wide ratio 389 tri power.

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post #8 of 28 (permalink) Old 09-12-2014, 11:39 AM
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I concur with Roger that. Right on the money. The '65-up engines weren't as specifically coded as the '64's.
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post #9 of 28 (permalink) Old 10-13-2014, 10:00 AM Thread Starter
 
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76xw

So should the block say 76xw or 76w if the manifest says it is a 76w
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post #10 of 28 (permalink) Old 10-13-2014, 10:37 AM
 
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Pictures of 2 different 64s with XW on the block. The second picture show the W way over on the right side. These are 78s and not 76s
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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