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Survival's ultimate hop-up for the Performer RPM castings is a complete porting job, including CNC-whittling of the intake and exhaust ports, as well as the combustion chambers. This adds about another 50 cfm (beyond the Stage X) to airflow, so that the heads will support in excess of 600 hp. Which means such porting may also be overkill for most any 445 application-remember, that 390 block is only good for about 600 hp-but is very useful for more exotic FE build-ups. View Related Article
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