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BBM head chamber size

April 18 2017 at 4:25 AM
Kimmo  (Login kno1)

What is the "nominal" chamber size for new BBM heads after the valves has been cut in place? Many Brocks seemed to have around 76cc. Of course the size can be changed quite a bit if needed, but is there a some sort of general size where they usually are. Thanks.


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