The head casting for ITR CTR and GSR are as follows...
The GR-R is P72 gen 3
The IT-R is P73 gen 3
The CT-R is P73
The Civic Si is P30
The P73 refers to vtec integra and the PR3,PR4 refers to vtec civic on almost all the parts except the cams they are the same except in the Si civic...
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