Cylinder Head Porting and Power Production

Even if was making 550hp, at that fuel flow...... the bsfc wouldn’t be anything great(.505 for 278lbs/hr@ 550hp).

I just get the sense that if the motor was actually being “tuned”, or maybe tested with a “known good” carb on it, the numbers(whether it’s hp, or bsfc and fuel flow) could look better.

It’s not just that the power seems on the low side...... it’s that the power is low and it’s using a ton of fuel.
If the power was the same as it is, but the fuel flow and bsfc were both “good”, then it would be easier to just pin it on a “bad combo”.

And, to put it into perspective for this thread....... if the heads are really 293cfm, then the current combo is showing 1.70hp/cfm.