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How bad is a leak between a pair of runners? I'm not talking about a leak to the valley just the shared wall of two runners.
 

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I have an RPM air gap with a 1/4" hole in the upper corner about 2" in the port between #6 and #8 cyl. It seems to run fine and the plugs look good, so I can't say it makes a big difference in my case.
 
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