Intake Manifold Flow #'s
From Hughes Engines..
Big block Edelbrock RPM
Stock average 285 CFM
Edelbrock Victor 440 Single Plane
Stock average 314 CFM
Mopar Performance Cross Ram Max Wedge 2X4 Casting# 2402726-IM
Stock average 309CFM
Indy Single Plane-- Max Wedge Ports
Stock average 461.8 CFM
Indy Dual-Plane, 440 Port size
Stock average 326.5 CFM
Notes: This intake has terrible core shift at the gasket surface. It must be repaired/upgraded with deep port match and epoxy work.
Max Wedge Cross Ram, 440 port size, 1962-1964 style
Stock average 282 CFM
Edelbrock Torker II 440
Stock average 297.5 CFM
Weiand Team G with Dominator Flange
Stock average 296.1 CFM
Weiand Team G B/B with 4150 base
Stock average 339.5 (This is not a misprint)
Thsi intake doesn't make the power of the victor despite it's flow. Why? This intake falls into what we call the square corner intakes. The fuel/air separation is bad in them, so more power is lost in the separation than is picked up in the greater airflow. Use an Edelbrock Victor!
Holley Street Dominator B/B
Stock average 282.3 CFM
This manifold is designed for a spread bore carburetor, like the M-1. Like the M-1, your money would be better spent on the Edelbrock Victor intake.
M-1 Intake Single plane
Stock average 298 CFM
The stock 440 Victor intake, Stage 1, would be a better choice from both a cost and power standpoint. The Victor is a lower-cost way to get equal or better power.
Big Block CH4B dual plane
Stock average 273 CFM
Notes: Money would be better spent on a new RPM intake manifold.
Big Block Edelbrock 6-pack dual plane
Stock average 302.2 CFM
We have dynoed a hydraulic cammed 493 cu in with stage 1 version at nearly 700HP.
Big Block Edelbrock 2x4Bbl dual plane
Stock average 286.4 CFM
Big Block 1964 300k short ram single plane--Stage 1
Stock average 247.25 CFM
Notes: This was the short ram version.