cookietruck said

per the attached photo that PRH posted up (from another thread) and should be the CNC speedmaster heads.
Seems like the unported Promaxx heads flow close to the same around .600" lift, but they flow more at low lift.
how much money is saved putting them together yourself vs. just getting some promaxx heads, then what will the promaxx do if someone port machted them and opened up the pushrod pinch some??

per pittsburgh racer, the promaxx unported heads...
----Edelbrock--------------ProMaxx
--------Intake-----------------intake
.200-----128--------------------129
.300-----182--------------------184
.400-----215--------------------235
.450-----226--------------------251
.500-----233--------------------255-260 high air-speed
.550-----236--------------------260
.600-----242--------------------264
.650-----243--------------------270
.700-----243--------------------263-270
.750----------------------------263-270

Click to expand...