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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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-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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