Carb Size for 454?

[Billla]

Originally Posted by MrC1

Agree with rage'n, but you could probably get away with a 700 if you're in stock form and not spinning past about 5000 RPM. If you've got enough cam to need 6000 RPM, go with an 800. If 6500, go 850.

A Q-jet flows about 780 CFM, and even some fairly warm Corvette 454s shipped with them. I'd stick with a vacc secondary carb.

There are a lot of things to look at with the symptoms you're noting, but I'd be surprised if it's the fuel pump. My guess is a) timing advance or b) the point where the secondaries are kicking in or the metering rods.

I'd keep the Edelbrock and tune it vs. making a change. They're great carbs for engines making <= 1.2 HP/CID FWHP.