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Gas flowing question.


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I had cause to take the carbs and manifold off my TR3a and took these pics of 2 inlets and an exhaust port. 
 

when gas flowing are the valve guides trimmed to the profile of the whole port ? Or is it needed as a set length to aid sealing ? or not matter as the valve stem is there anyway ?

FECEC3DE-8104-4ED7-B0E3-CE2807403F86.jpeg

613874AF-3FF8-4062-8B65-E15C5C340679.jpeg

E58D04E8-8E8F-4BC3-ABA4-2C46F934C575.jpeg

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