So after playing on the flowbench for two weeks of testing, we have some results for the Standard Stealth, RPM and 906 iron head with the standard stock intake port windows.
At .700" lift the Stealth went 337 cfm, the RPM 335 cfm and the 906 went 338 cfm. When we opened up the intake port windows, the Stealth went to 346 cfm and the Edelbrock RPM went to 350 cfm. The 906 heads in this session were not tested with the raised port window.
Funny thought. You could buy valves, springs and porting, a pair of $999.90 Stealth heads, and have heads that flowed as good as bare, CNC ported B1 BS heads for way less money. Stealth heads, not the "Super Stealth". I have no idea what "SS" heads may do. HAH, maybe nothing!
