Cylinder Head Porting Porting Combustion Chambers 2
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....This process will increase the size of the combustion chamber slightly, so that must be taken into consideration when calculating compression, but is easily accomplished with the same tools used for head porting. We keep a second-hand set of valves around and use them to protect the seats while grinding. Care must be taken to remove an equal amount from each chamber; otherwise volume will be inconsistent, possibly affecting performance. We suggest cc'ing the head after any chamber porting to ensure chamber volume consistency. View Related Article
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