Exhaust port porting?

Remove the wedge.

On our RPM heads with the 1.78 valves and flowing 285 cfm, the port is 2.49 sq in. vs the 2.498 sq in of the valve. The RPM heads that made 787 HP naturally aspirated on the 451 engine have a 1.81 valve (2.572 sq in) vs the port opening of 2.467 sq in. I have not run a turbo charged engine myself but those that I have associated with, who were making 1,700 HP to the rear wheels, said to put the best flowing exhaust port on your engine that you could.

We've been through this crap with a bunch of diesel engine guys. They keep adding boost on the stock head using twin turbos and make 900 HP. We ported the head, used a single turbo, stock cam and made 1,400 HP. Of course the owner failed to upgrade the valve train and blew the engine apart at 1,400 HP.

We will be finding out soon as we are in the process of building a 572 ci, all aluminum, twin turbo wedge. I can promise you the heads will be made to flow everything we can get out of the exhaust.