New best flow numbers for Edelbrock heads

1bad360duster said
Why does the gasket size matter so much if the bore is only say 4.03-.04? I’ve seen this on other heads too

Trust me it just does. The air has to get out past the chamber wall. You can even see this flowing a stock Speedmaster head and a stock Edelbrock head. The Speedmaster chamber is much nicer around the intake valve.