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Old 12-29-2018, 08:37 AM
  #2  
BigBlockMark
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Join Date: Mar 2014
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Close chamber heads are smaller in CCs in combustion chamber, like low 100, and open chamber are like 119 CC. No one uses closed chamber heads for racing anymore, but it also depends on what the pistons are sized for. Not many modern pistons available for closed chamber heads, but if pistons are already in shortblock and are for closed chamber heads, using open chamber heads will result in low compression.

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