I’m sorry but I get so tired of hearing these heads (TrickFlow) are to small for 400 cubic inches. My Edelbrock heads cc’d out at 191 intake runner on the heads I ported and ran 9.74 on a worn out block (3 rebuilds and in need of its 4th) at Keystone in the middle of summer. This isn’t an East coast super track. Don’t get me wrong a W2 is a great head but it’s not the wholly grail.