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post #1 of 3 (permalink) Old 09-09-2012, 04:08 PM Thread Starter
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I have a set of #061 heads that were cast in 1967. They have the large valves with a unique open chamber design. The rocker studs are pressed in and also pinned. My two questions: Did the factory ever pin the studs? What is the correct cc of the chambers? I have seen several web sites that give the chamber size as 72cc, 75cc, 80cc. When I tried to measure the chambers with a cc syringe it seemed to be aprox. 77cc. These heads do not appear to ever have had a valve job. Any one know the straight scoop about these chambers?
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post #2 of 3 (permalink) Old 09-09-2012, 09:01 PM
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Trust what you measured. Pontiac heads are known to vary quite a bit from published factory specs, even between different heads with the same casting numbers. This is one of the big reasons it's so important to measure them.


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post #3 of 3 (permalink) Old 09-11-2012, 11:32 AM
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I ran a set of 061 heads on a 400 in my first GTO many moons ago. They are a great performing head, and the earliest "open" chamber design. Upgrade to screw in studs and you're good to go.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion

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