I'm looking for some opinions on whether it's advantageous or not to remove the "wall" right behind the throttle body in the plenum.

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89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

 

Thats usually the first thing to go, is that wall. Take it down so there is a smooth entry into the plenum. Cant do much else to fix GM's poor design other than that and grinding the sides a little there in the front too, but be careful I hear its thin on the sides. Other than that, just make sure the ports at the runners are the same size as the gaskets.

 

Radius the runner entries. Has anyone figured out what taking down that wall does to EGR dispersion?

 

Im sure it doesnt help the EGR, just by looking at the design. But who cares.

 

I should just nix my EGR so I don't have to worry about it, but I'd hate to know what all the EGR going to a couple of cylinders does to those cylinders.