Author Topic: 1977 W72 Pontiac 400: Y6, YG block code?  (Read 2893 times)

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Offline 4SPEED

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1977 W72 Pontiac 400: Y6, YG block code?
« on: October 18, 2009, 05:16:14 AM »
1977 W72 Pontiac 400: Y6, YG (automatic) WA (manual)  block code

what's the difference between the Y6, YG block?   is one early 77 and other late 77?



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Offline RENOVATIONS

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #1 on: October 18, 2009, 11:03:58 AM »
Y6 is the W72 400 (auto) for '77...I'm not aware of a YG in '77.
Jeff

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Offline 4SPEED

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #2 on: October 18, 2009, 02:18:08 PM »

1977 L78 Pontiac 400: XA
W72 Pontiac 400: Y6, YG (automatic) WA (manual)
Olds 403: VA, VB, U2, U3

http://www.78ta.com/enginecodes.php
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Offline fb_rider

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #3 on: October 18, 2009, 03:29:16 PM »
I don't think there's a YG.  I think that it's just easy to mistake the Y6 for YG, so in some places (I think on this site as well), it's listed as Y6 and YG.
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Offline 4SPEED

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #4 on: October 18, 2009, 04:07:44 PM »
ok ya, I could see were the 6 could look like a (G)  thanks.
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Offline y88rick

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #5 on: October 18, 2009, 04:17:18 PM »
i need the Y6 block for my 77
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Offline 4SPEED

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #6 on: October 18, 2009, 04:48:34 PM »
rick I have both.  Y6 and WA motors.  tha auto is #'s to it's car. but will sell the WA block

« Last Edit: October 18, 2009, 04:50:30 PM by 4SPEED »
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Offline y88rick

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #7 on: October 18, 2009, 05:20:46 PM »
right
 i'd love to have a w72 motor but if im going to go through the hassle, i'd like to get a y6 and i wouldnt need heads either as i still have those just no longer have the correct y6 block and even if it isnt #'s for my car, atleast it would be a correct style block.
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Offline 4SPEED

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #8 on: October 18, 2009, 05:45:29 PM »
sure I would want the Y6 to. I will keep my eye open for another.
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Offline y88rick

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #9 on: October 18, 2009, 05:46:09 PM »
appreciate it buddy.
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Offline Hitman

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #10 on: October 18, 2009, 10:08:22 PM »
I don't think there's a YG.  I think that it's just easy to mistake the Y6 for YG, so in some places (I think on this site as well), it's listed as Y6 and YG.

The YG engine is listed in the GM parts catalog for the engines and original GM liturature, so it is not a typo or a mistake.
Brett Campbell
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Offline 4SPEED

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #11 on: October 18, 2009, 10:20:17 PM »
thanks Brett. I nu you put it there for a reason
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Offline Maxthe222

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Re: 1977 W72 Pontiac 400: Y6, YG block code?
« Reply #12 on: August 24, 2017, 03:30:36 AM »
Bit of a strech but that Y6/YG block if you've still got for sale, what was the partial VIN on that one? Been trying to track down an old engine for a SE T/A