On the intake manifold, on the side where it connects to the engine, there are the 4 large bore holes for mixture intake and 3 smaller oval holes, what is their purpose.
One seems to lead to nothing, one goes straight through the middle and one opens to a connector tube on the other side. I assume thay are connected to heating the carb but not sure. Are they water passages or exhaust? I cannot find a layout or schematic with purpose or connections. Any help is highly appreciated.
