RHS big-block Chevy 320 head flow tests.
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Here are the "as cast" numbers for the RHS heads.
Even as cast there is enough airflow From the RHS 320 heads for 700 hp on a 540-inch engine. When simple porting techniques (that is no more complex than a near beginner might do over a couple of week ends at home) are applied the numbers look even better. The figures achieved with the T&L ported heads are as below.