Hello everyone i just spent the last 6 hours reading in this forum and learned a tremendous amount of information thank you.

I am building my first big block for the track a 427.

I have what everyone is calling small oval closed chamber heads, and i am told what i am doing will work great for a bracket car but I am bieng advised to put in a evacuation kit through my headers to pull exces vacum out of the engine, i have seen this done on alot of engines, is it worth my time to drill and tap the hreaders and install this? what will I gain or any at all?

Thanks..