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Arthur----
The flow out of those cylinders are away from the spark plug a little bit and a pretty good sized dimple in the header tube wont hurt your performance( it might even increase the flow numbers!) Take a medium sized ball peen hammer and set it on the header tube where you need the clearance and tap it with another larger hammer to indent the tube for a bit more clearance----work it patiently (whats a 1/2 hour added to 10 years?)
Good to hear that you are driving it this summer-----
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