400 Block ID ? - Pontiac GTO Forum
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post #1 of 18 (permalink) Old 11-28-2018, 10:21 PM Thread Starter
 
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400 Block ID ?

Just my 1st view of this 1970 242370Pxxxxxx
Car being sold as 1970 400 4 speed ... non matching
Owner said the non matching 400 was a 1970 YD code that has been rebuilt and has many differing parts (heads / intake / exhaust / carb ...)
BUT the Front Block clearly says YS but no other numbers are seen in that area (odd ? though not important)
the Rear Facing Back Passenger side Block is cast is 841988
the Rear Top under the distributor is (see attached) I can't really tell what it says (hard to see and photo)
the Front Right along the side of the timing cover is blank (as far as I could see)

Thats all I got (so far)

I prefer a 1970 Block but not a deal breaker

Can someone read the 2 pix attached under the distributor ? for the year ?

also the passenger side head "front facing" reads SR 834 - I can't find any thing related to that head number ... (no big deal anyway +-)

Thx

C
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post #2 of 18 (permalink) Old 11-29-2018, 08:15 AM
 
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I assume you meant to type 481988 for the block casting number. These were used in '71 thru early '75 model cars. Not used in '70.

The date code looks to me to be A041. if this is the case, it was cast Jan 4, 1971. A block with that date code would likely to have been used in a '71 model car.


Looks like a YS code 481988 block could have been used in a '71, '72, '73, or early '75.

Wallace Racing's Pontiac Engine Search

The head ID numbers would be cast with the head, over the center exhaust ports. '71 400 4-barrel heads would probably be #96. But, most any Pontiac heads could have been bolted on, at some point in time.

The 1st pic of a #96 head, shows a date code of L150. So, it was cast in late '70 & used on a '71 400 engine. The 2nd pic is a #96 head with a B191 date code, cast in Feb of '71. It was also used on a '71 model engine. Don't know how many different months these were cast in. But these heads were used only on '71 model year 400 engines.
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Last edited by bigD; 11-29-2018 at 08:52 AM.
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post #3 of 18 (permalink) Old 11-29-2018, 09:32 AM Thread Starter
 
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the Rear Facing Back Passenger side Block is cast is 841988 = wrong

Yes my typo -

it's 481988 on the block rear and clearly says YS on the front

can anyone decode my low quality picture of the cast block number code from under the distributor ares ?

I can't

Thanks

C
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post #4 of 18 (permalink) Old 11-29-2018, 12:12 PM
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Quote:
Originally Posted by Cosmic Charlie View Post
t

can anyone decode my low quality picture of the cast block number code from under the distributor ares ?
Yes, BigD already responded to you on this, but I'll repeat. Date code is A041 - January=(A) 4=(04), 1971=(1) - that's a model year 1971 block.


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post #5 of 18 (permalink) Old 11-29-2018, 12:33 PM Thread Starter
 
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Thank You

1971 400 YS code engine

Year Engine HP Engine code Trans CR Cam Head Code BBL Carb No. Misc
1971 400 300 HP YS A 8.2 067 96 1-4 7041264 Block Casting # 481988

Now it has been rebuilt to ... frankenmotor ...
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post #6 of 18 (permalink) Old 11-29-2018, 06:00 PM
 
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"also the passenger side head "front facing" reads SR 834 - I can't find any thing related to that head number ... (no big deal anyway +-)"

"SR" typically means "Service Replacement." However, this would be found on the front of the block and not the head.
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post #7 of 18 (permalink) Old 11-29-2018, 07:12 PM
 
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Interested in seeing a photo of the SR stamp along with a zoomed out view to show relative location.

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post #8 of 18 (permalink) Old 11-29-2018, 07:30 PM Thread Starter
 
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SR 834 sorry to say I didn't take a picture - it was so clear ...
It was somewhat above the YS stamp, on the right bank head facing the radiator
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post #9 of 18 (permalink) Old 11-29-2018, 07:34 PM Thread Starter
 
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here is some info from 2 sellers ago
obviously some of it is NOT correct
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post #10 of 18 (permalink) Old 11-29-2018, 07:38 PM Thread Starter
 
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and this
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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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