John Maddison’s Blog…

Cobra Master and more…

Correct Carb sizing for your motor

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!)

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July 1, 2007 - Posted by | Uncategorized

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