Some good points Brian.My ra4's flow in the 295-300 range@28"at 650 lift.My E heads that I am working on flow 330@700 lift.Will be a good comparison to see if the E head out performs my steel heads.I think velocity may be the key here,with the bowl being much smaller with the iron head.Once I get finished with the new heads,will post some results,comparing the difference.
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