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.

Your welcome, happy to share.
Just like sharing something that I thought was a cool and interesting experience. I really enjoy learning and am very privileged to have great people close to me who are willing to teach me.

If you ever buy an aftermarket block, I would immediately punch it out to a 4.500 bore. When we took mine from 4.3750 to 4.500, we saw very good gains.