Exhaust heat crossover

["Ronak, TP (Timothy)" <Timothy.P.Ronak@akzo-nobel.com>]

Chris,
That little hole is to help provide quick warm-up for the EGR on most cars.
It allows exhaust gases to flow through the intake and choke passages to
warm up the engine (Carb) quicker.  In the past I have covered this as the
aftermarket carbs I used had an electric choke and rendered this less than
useful. You will probably get better explanations to follow but I would
leave it blocked off and not give it a second thought.
Regards,
Tim Ronak