64 cylider head questions - Pontiac GTO Forum
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post #1 of 5 (permalink) Old 09-07-2013, 09:03 PM Thread Starter
 
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64 cylider head questions

Can anybody tell me what the difference is between the 9770716 and the 9773345 heads? They both seem to have the same size valves.
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post #2 of 5 (permalink) Old 09-10-2013, 06:37 PM
 
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9773345
-9770716
=========
0002629

I'm here all week!

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post #3 of 5 (permalink) Old 09-10-2013, 07:50 PM Thread Starter
 
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guess I had that coming
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post #4 of 5 (permalink) Old 09-10-2013, 09:13 PM
 
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-9770716 were the GTO heads
The 9773345 heads were used in both big car 389 applications and the 2 bbl 326. The advertised cr was 10.5 and 8.6 respectively.
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post #5 of 5 (permalink) Old 09-23-2013, 09:20 PM Thread Starter
 
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CR is the chamber size? Is that the only difference?
Thank you!
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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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