Carb Sizing

[CHANMADD]

I have a 406 cu with pretty much all the goodies,the aluminum heads could take a little more porting,11.5 compression 1.6 roller rockers with a Victor junior single plane manifold which I shift at 7500-8000 and I have run the same old 800 spreadbore double pumper for ages.The carb gives me decent mileage( small primaries) and when I stomp on it ,it pulls like like there's no end.The equation above works out right at 792 cfm with 90% VE.I have thought about changing to a square bore carb on many occassions,but I know that I will suffer in the gas mileage.I believe for the street the spreadbore is hard to beat. (I don't want to start another argument though!)

[DAVID GAGNARD]

I would think NASCAR is running 100% VE with their motors...........

I'm looking at my dyno printout and according to it the pulls started at 3500rpm to 6500 rpm, from 3500 to 6500 the VE never was below 88.03% with the best VE at 6000 which was 96.04%.....the average VE acroos the rpm range was in the low 90's........

This is a 331 cu in, with Eldelbrock RPM Performer heads, Victor Jr. intake and a 650 DP Demon carb, 586 lift roller cam......Not to shabby for a motor built in my garage..........

David