So i h.ad a buddy of mine put my head on a flowbench for me to get baseline so i can do a lil p&p work. the results were kinda suprising the intake was doing work but the exhaust would stop flowing after about .3" lift. Heres some of the numbers...
intake
Valve lift in inches.. .1 .2 .3 .4 .5
Total cfm 81.84 147.8 171.44 189.18 203.9

exhaust
.1 .2 .3 .4 .5
59.7 128.7 148.05 148.05 148.05


so as you can see the intake does a decent job but the exhaust is slackin. the cower 404 max lift is 445/434 so it really doesnt need to flow much past that.

so what are some good ways to get that exhaust flowin?? i was thinking bigger 1mm oversized valves on both sides... any input??

 

flow above max lift does matter actually. And if you dont understand why do not do any other port work except for removing casting marks. As for the exhaust, if you dont adjust the bowl area for the OS valve its worthless to go OS. You can raise the roof of the port a little bit but you dont wanna go to much. The valve job is whats gonna help the flow the most.