500 cfm edelbrock enough?

[KnockingDiesel]

I ordered a GM goodwrench 350, 240 hp, for my truck. Nothing fancy, just gonna be a daily driver (for when the CC/LB DRW feels to hard to drive), should not see anything above 4500 rpm tops, half that cruising.

I came across this formula, CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456. It was also stated that 75-85% volumetric efficiency is typical. I went with 85% just in case

I did the formula and 350 cubic inches @5000 rpm needs 430.41 cfm @ 5000 (redline).

Does that seem correct? I have a edelbrock 4 barrel performer intake (edelbrock 2101 idle-5k rpm) and a 500 cfm edelbrock electric choke carburetor. Both are nib left over from a project.


Any info or replies will help!

Btw I Know what too much carb feels like, when I was looking for a truck i drove a 305 with a 750 cfm, it was not drivable.

 

[1987 GMC Jimmy]

500 CFM is a good way to go, and your calculations are in the ballpark. I'd say if you wanted a Quadrajet, you wouldn't have to worry about any of that, but you've already got the intake and carb so go for it!

 

[vkh]

I've heard of plenty of people run 600 cfm edelbrock carbs on 454s, that carb will be just about perfect.

 

[KnockingDiesel]

Cool, thanks for the quick replies.

 

[74 Shortbed]

I ran a 600 on my dually with a camper and towing the boat, works great, the formula above is correct, a 600 is plenty for anything under 4000rpm...