I would be more concerned with the low-lift flow numbers,where the camshaft actually is.If they flow 325cfm at .700" lift,who cares because your cam is nowhere near there.Just an example.

 

That's true.

If you want to boost low to mid lift flow, I will tell you exactly how to achieve that, 99% of your head porters will dance around the subject and try to convince you it's all in the way you port the head but I won't bullshit ya to death like that. If you want to boost low and mid lift flow, install semi tulip headed sbc valves, that's it, it's not in some magical way to porting the heads, it's all in the shape of the valves head. I would recommend 2.05" to 2.08" for SBO and 2.10" to 2.125"for BB Oldsmobiles would be best. 1.60" to 1.65" on the exhaust side is all that's needed.

My heads don't flow no where near 325cfm @ .700" lift. My heads have factory 1.99" 403 intake valves and 1.625" bbo valves with a three angle valve job instead of 5 angle valve job because wider valve seats last longer than a narrow ones do between valve jobs. You'll give up some flow but you won't be doing valve jobs every year or every 5000 miles either.

I didn't go to a camshaft with more lift or more aggressive open & closing lobes because I wanted to see what kind of gains could be achieved just porting the heads.

I also wanted to debunk the theory about how putting BBO heads on a SBO will kill low RPM torque. Sure my heads aren't BBO heads but they slightly larger intake ports and they out flow the best big valve BBO head and I'm using smaller valves.

Jerry Wroblewski once said, you can't make the intake port big enough in it's stock location to make big flow numbers or make them big enough to kill low end torque on an Big Block Oldsmobile do to the limited width and height you can go without moving pushrod bores or before grinding into valve spring pockets. He's is the guy who had F heads on a BBO making close to 750 horsepower. He was also the engine builder for a NHRA Pro Stock Team back in the 90's and he is the only guy I know of who had a 7 second 1/4 mile BB Oldsmobile with doors too.

I think I proved, you can't make the intake ports too big for even a mild, low compression, street driven SB Oldsmobile either. My car runs better 60ft. times, 300ft. times, 1/8th mile times, 1/4 mile times and faster mph @ every point on the track than it did with slightly larger than stock SBO intake sized ports ever did and I'm not done tuning the engine or chassis yet.

 

How is that apples to apples, you have ported heads vs unported heads? If you port the Edelbrocks the same way as his F heads I promise you you'll get similar results. In fact maybe better results due to the better combustion chamber and exhaust ports on the Edelbrocks.

And low lift flow is enhanced by the seat area and angle, not just the valve. Just change the valve and seat angle from a 45 to a 30 and you're likely to see a noticeable difference. Works just about every time.