I was looking at my holley manual and i cam across the cfm formula ( cubic inches divided by 2) x (maximum rpm divided by 1728) x volumetric efficiency well i figured out what i said i would need for my motor a 351C 4v that is bored .30 over and i figure that my max rpms will be around 6100 rpms. and i put 80% as my volumetric efficiency because they said 80% was a mild engine. anyway that formula says i need a caruretor that is about 500cfm so i would guess i would go up to a 525 cfm carb. But what do yall think about this it seems that this is kinda a small carb compared to what every one else talks about putting on their motors. so is this fomula right?