440-1 flow numbers

Jeremiah (jd) said
The heads I am referring to all had 2.20-2.250 intake valves. It seems like the 2.300 intake valves really picks up some power.

Thank you for sharing that info. It seems like the outlier heads are cnc and in addition hand ported to breach the 400cfm mark.

Of course there are people out there that claim 5,000,000 CFM from their Edelbrock RPM castings. Most of those combinations never make it to a track.

I think you need at least a 4.400" bore to go .800 net lift with a 2.30" intake.

All of my junk is 4.375" bore and 4.25/4.15" stroke.

I keep saying the last 400 block was my last stock block deal. Then I buy another 400 block.

I 'only' am using the 2.25" and think it would make over 1000 with a couple of tweaks but, yes the 2.30' would show MINOR improvement. I'm using the TR 2x4 but, I feel if it's on a RB block and the 3x single is used it'd make more power. A custom intake 'done right' would be above that. I'm not sure at what point the head gets critically thin where it'll crack. My heads aren't done to that level FWIW.