RB25 head on RB30
14 Sept 2007The problem with an RB20 head, apart from the unfortunate water jacket locations, is that the valves and ports are far smaller than with an RB25/RB26 head. It will severely limit the airflow capacity.
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The problem with an RB20 head, apart from the unfortunate water jacket locations, is that the valves and ports are far smaller than with an RB25/RB26 head. It will severely limit the airflow capacity.
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