TECHNICALLY SPEAKING, I DIDN'T DO ANY PORTING, I SIMPLY UNSHROUDED THE VALVES. WITH ASSISTANCE FROM MENTOR BRIAN TOOLEY, I TOOK TO THE CHAMBERS ON THE 706 HEADS AND IMPROVED THE FLOW RATE BY 10-15 CFM JUST BY UNSHROUDING THE VALVES ON THE SMALL-VALVE HEADS. WHAT IS THE KEY TO SUCCESS?