Quote: I did a swap from a set ported 906 heads with 2.14 and 1.81 valves to a set of CNC ported Eddy RPMs and gained 2/10 and 4 MPH I beleive the stock out of the box B1-BS are better than the stock Eddy RPM as far as flow, my stock OOTB Eddy RPMs outflowed the ported big valve 906 heads
On a 452 motor I went from a fully ported 906 to an OOTB(port matching only) BS head and went from mid 10's/128 to a best of 9.76/136. The small CC of the BS head upped my CR significantly(probably 2 full points) besides the better flow of the head itself. I also went from 1.5 to 1.6 rockers on the change.
I beleive the stock out of the box B1-BS are better than the stock Eddy RPM as far as flow, my stock OOTB Eddy RPMs outflowed the ported big valve 906 heads 