650 dp vs 750 dp in a 408

Early a body said
I tried a 650 dp on my 408 after having a edlebrock 750 that i really did not like. What a difference it pulled much stronger. Then I put a 750 dp on because it makes sense that the 750 would be better than the 650 given the cubes. Nope the 650 absolutely out pulled the 750 dp. Both carbs are new, within the last 3 years. What gives? I have not messed with the jets or PV of either carbs. Is it simply because the smaller carb provided more torque because its smaller? Completely surprised at the difference in performance between the carbs.

What you are more then likely experiencing is the smaller venturis that are providing a higher velocity to better atomize the fuel in the air. This Leeds to a quicker air fuel charge for a snappy throttle and a better burn at low/mid engine speeds. The more the atomized the fuel is at the mid and lower speeds, it should make more torque.

If you had time slips and ET.’s... it would help. State of tune as well. IMO, the 750 should beat it all around.