offy 4 barrel with Dutra Duals question?

hey mr anderson, thanks for the response. Yes i am using the two piece Dutra Dual exhaust. My confusion with using a block off plate is what does it accomplish? Sounds like you are telling me it is optional. Without the block-off plate, what keeps the exhaust manifold from having a huge exhaust leak?

When you use a stock super six set up, the exhaust and intake manifolds bolt together. The hotbox area is the most common place for an exhaust leak because the seal is between manifolds is not perfect.

Does my confusion make sense? can you help me understand it a little better?

thanks so much

Keni