Whats the max flowed cfm ever done on A Hemi Head???

minidragbike

minidragbike

Supporting Speed Nut!
#2
#2
A cast Hemi head, the most I heard of is 121cfm. But that was tested way up to .600" lift. Which is way above it's operating level.

Try to get the best numbers by .400" lift.

Now as far as a billet head goes, I have seen some really good numbers.
 
minidragbike

minidragbike

Supporting Speed Nut!
#4
#4
It's currently none on the market.

But the old flat valve versions that had 32mm/28mm valves use to flow 120cfm @ .500" lift.
While the hemi style billet head had 34mm/29mm valves and flowed 150cfm @ .500" lift.
 
S

SoFloMiniBikez

Member
#6
#6
So a little update on post I did a small Port job on my hemi head and then sent it out to get bigger valves put in the head and paid a little extra to flow my head with the new valves I got 94cfm very happy to know were i stand with my head
 
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