Dual Plane Septum Modification??

[Bobfish]

Initial Investigation..... Due to hood clearance issues the only intake I can run is Edelbrock Performer RPM. #7193. Ive been told by modifying the septum I can get more volume thereby more power. Has anyone done anything like this? How much is to much? Pros/cons? and was there an increase in HP/TQ? What would happen if ya gutted the plenum and had (basically) a "low rise" single plane? Thx, Bob '73 ORR 'Cuda

[Chryco Psycho]

it definatly helps to drop the divider down , usually about 1" is enough , of course the end result is dependent on the whole package such as head work / cam , headers etc

[Rob C]

I've done this mod to a LD-340 as per the engines book by MP.
I would not recomend this for a small cam/basic street engine. It does work well once the cam gets big(ish) and the engine package is a plus 470HP like type package.
The idea behind the plenum milling is to take a dual plane and create alot of plenum like a single plane.
If the RPM fits under the hood of the car with the carb on top, I findlittle need to cut the plenum divider. If you need a single plane intake, a Torker will do.