Trick flow 240s on milder builds versus Edelbrock RPMs

IQ52 said
Sage advice. If you already have the RPM heads......use them.
Simply for reference, on my bench with the only OOTB 240 heads I have tested, here are the airflow differences vs OOTB RPM.

Lift............240 additional cfm vs OOTB RPM
.100..........+0
.200..........+0
.300..........+11
.400..........+37
.500..........+58
.600..........+65
.700..........+53

I do like the additional 240 airflow.

What Andy says about being able to port the RPM heads later is true. A well ported RPM with larger valves will lack very little when compared to the 240 Trick Flow gains quoted above.

Lift..............Ported RPM cfm gain vs OOTB RPM
.100..........-7
.200..........+0
.300..........+9
.400..........+34
.500..........+41
.600..........+65
.700..........+60