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he Tiger's chamber is a true heart shape to promote swirl. Notice also how the spark plug is angled to get as near the center of the cylinder as possible for better flame propagation. "High swirl heads require less timing," Don says. So more torque can be made. He also noted that the sheering effect at the plug boss keeps the mixture better atomized. The chambers are 75 cc and the intake valve was moved .070 from the wall as compared to a stock head but the exhaust valve remains in its stock location. Combustion chambers will be CNC machined in the production heads.