I'm going to be playing with the wagon a bit, so I figured I'd start cheap and see what improvements I can make. I'll be adding a Hedman header in the near future, but I wanted to see what I could do with a stock intake. I picked one up from Fred and promptly disassembled it as soon as I got it home.
First, I'm keeping the stock Holley/Weber so the adapter plate will be staying. When you look at the adapter, you'll notice a couple things. The (for lack of a better name) flow plate on the backside of the adapter has a significant mismatch in the throttle bores. I figure it certainly can't
help flow, so I'll start by smoothing the bores.
I've smoothed both bores, but have some finish work to do on it. Smoothing the bores more won't buy any more, but I have to have things a certain way. It'll be perfect. While I was at it, I tapped the EGR hole and plugged it, but if I ever want to put it back on I can.
In the plenum on the intake, the runners have very sharp edges as they enter the plenum. I know air doesn't like to turn corners, and it REALLY doesn't like sharp corners, so I've radiused the port edges to smooth flow into the runners. I'll be doing a quickie port match to the head when I replace the intake, but until then there's not a whole lot more I can do with this intake.
Hopefully these little changes will help not only smooth the flow for more rpm, but help atomization by keeping the air/fuel mixture from breaking down when going from the plenum into the runners. Will it wake it up more when I add the header? We'll see......