please help with head casting number - Pontiac GTO Forum
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post #1 of 16 (permalink) Old 01-05-2013, 10:24 PM Thread Starter
 
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please help with head casting number

Can't make out the casting number. Please help. This is my first post. Car is a 70 400 gto 4 speed if it matters.

Last edited by rjinator; 01-06-2013 at 12:05 AM.
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post #2 of 16 (permalink) Old 01-06-2013, 12:01 AM Thread Starter
 
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anyone?? from what i have looked up i should be looking for a 11 or 12 but this looks like a 7
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post #3 of 16 (permalink) Old 01-06-2013, 07:12 AM
 
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in the upper right corner of your picture of the head, there is another casting. clean it off and try to read it...
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post #4 of 16 (permalink) Old 01-06-2013, 07:29 AM
 
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I would say 11 .
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post #5 of 16 (permalink) Old 01-06-2013, 07:19 PM
 
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The 1 looks pretty clear. Other # looks like a 2 to me. What does the passenger side head say? If its the original motor and like you say its a 70 GTO 400 4 speed, then it should be #12 heads. According to the chart in the link #12 were on stick cars, 13 automatics. #11 heads were small valve heads on 350 2 bbl engines.
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post #6 of 16 (permalink) Old 01-06-2013, 09:15 PM Thread Starter
 
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The pass side is near impossible to read. The exhaust port to the right of the head bolt in the picture has two "2"s stamped (not cast) into it.
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post #7 of 16 (permalink) Old 01-06-2013, 11:04 PM
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Garage
In your original photo, the upper right corner, on the rail just below the valve cover, there's a 4 character code. I can't read it in the photo --- what does it say?

Bear

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post #8 of 16 (permalink) Old 01-07-2013, 08:37 AM Thread Starter
 
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it really hard to read but it looks like 'a160'
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post #9 of 16 (permalink) Old 01-07-2013, 09:52 AM
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That would be January 16th 1970. Head casting numbers that started with a
"1" were 11, 12(manual and depending on the engine code, RAIII), 13(auto), 15(455) and 16. None started with a 7.



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post #10 of 16 (permalink) Old 01-07-2013, 09:57 AM Thread Starter
 
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awesome. thank you. that means its an all numbers matching engine. so how do i go about finding out if its a 11, 12 or so on?
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance

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