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Friend has 71 windsor bottom end with 289 heads for dirt track racing in street stock class. When motor warms, engine starts to miss. Checked tank, lines, changed brian box, wires, carb, fuel pump has pressure. help?
 

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Is your water/antifreeze level staying right up?
 

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Does he have the rocker arms set too tight? Once the engine warms up the valves could be staying open. Does the engine pop out the intake or exhaust? Just a thought. Good luck.
 
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