Im going to be building my NA 7m to be a high RPM engine. It will mostly be living in the 4k RPM zone and up. What is the maximum CFM flowed on this head? And what mods have been done to the head to flow that much? RPM range of engine it was on? Aspiration? Type of springs used? Cam used? Cam profile? Lift? Size of ports if they have been enlarged? Type and size of valves used along with the type of valve job? SPECIFIC DETAILS PLEASE!!!! And only verified numbers with a flow bench, not some "I did this and it works well" and make #### HP. Any info would be great!!! Also, BC cams stage 4? Anyone know the specs for these? Anyone used them?
